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Gridcoin 5.0.0.0-Mandatory "Fern" Release

https://github.com/gridcoin-community/Gridcoin-Research/releases/tag/5.0.0.0
Finally! After over ten months of development and testing, "Fern" has arrived! This is a whopper. 240 pull requests merged. Essentially a complete rewrite that was started with the scraper (the "neural net" rewrite) in "Denise" has now been completed. Practically the ENTIRE Gridcoin specific codebase resting on top of the vanilla Bitcoin/Peercoin/Blackcoin vanilla PoS code has been rewritten. This removes the team requirement at last (see below), although there are many other important improvements besides that.
Fern was a monumental undertaking. We had to encode all of the old rules active for the v10 block protocol in new code and ensure that the new code was 100% compatible. This had to be done in such a way as to clear out all of the old spaghetti and ring-fence it with tightly controlled class implementations. We then wrote an entirely new, simplified ruleset for research rewards and reengineered contracts (which includes beacon management, polls, and voting) using properly classed code. The fundamentals of Gridcoin with this release are now on a very sound and maintainable footing, and the developers believe the codebase as updated here will serve as the fundamental basis for Gridcoin's future roadmap.
We have been testing this for MONTHS on testnet in various stages. The v10 (legacy) compatibility code has been running on testnet continuously as it was developed to ensure compatibility with existing nodes. During the last few months, we have done two private testnet forks and then the full public testnet testing for v11 code (the new protocol which is what Fern implements). The developers have also been running non-staking "sentinel" nodes on mainnet with this code to verify that the consensus rules are problem-free for the legacy compatibility code on the broader mainnet. We believe this amount of testing is going to result in a smooth rollout.
Given the amount of changes in Fern, I am presenting TWO changelogs below. One is high level, which summarizes the most significant changes in the protocol. The second changelog is the detailed one in the usual format, and gives you an inkling of the size of this release.

Highlights

Protocol

Note that the protocol changes will not become active until we cross the hard-fork transition height to v11, which has been set at 2053000. Given current average block spacing, this should happen around October 4, about one month from now.
Note that to get all of the beacons in the network on the new protocol, we are requiring ALL beacons to be validated. A two week (14 day) grace period is provided by the code, starting at the time of the transition height, for people currently holding a beacon to validate the beacon and prevent it from expiring. That means that EVERY CRUNCHER must advertise and validate their beacon AFTER the v11 transition (around Oct 4th) and BEFORE October 18th (or more precisely, 14 days from the actual date of the v11 transition). If you do not advertise and validate your beacon by this time, your beacon will expire and you will stop earning research rewards until you advertise and validate a new beacon. This process has been made much easier by a brand new beacon "wizard" that helps manage beacon advertisements and renewals. Once a beacon has been validated and is a v11 protocol beacon, the normal 180 day expiration rules apply. Note, however, that the 180 day expiration on research rewards has been removed with the Fern update. This means that while your beacon might expire after 180 days, your earned research rewards will be retained and can be claimed by advertising a beacon with the same CPID and going through the validation process again. In other words, you do not lose any earned research rewards if you do not stake a block within 180 days and keep your beacon up-to-date.
The transition height is also when the team requirement will be relaxed for the network.

GUI

Besides the beacon wizard, there are a number of improvements to the GUI, including new UI transaction types (and icons) for staking the superblock, sidestake sends, beacon advertisement, voting, poll creation, and transactions with a message. The main screen has been revamped with a better summary section, and better status icons. Several changes under the hood have improved GUI performance. And finally, the diagnostics have been revamped.

Blockchain

The wallet sync speed has been DRASTICALLY improved. A decent machine with a good network connection should be able to sync the entire mainnet blockchain in less than 4 hours. A fast machine with a really fast network connection and a good SSD can do it in about 2.5 hours. One of our goals was to reduce or eliminate the reliance on snapshots for mainnet, and I think we have accomplished that goal with the new sync speed. We have also streamlined the in-memory structures for the blockchain which shaves some memory use.
There are so many goodies here it is hard to summarize them all.
I would like to thank all of the contributors to this release, but especially thank @cyrossignol, whose incredible contributions formed the backbone of this release. I would also like to pay special thanks to @barton2526, @caraka, and @Quezacoatl1, who tirelessly helped during the testing and polishing phase on testnet with testing and repeated builds for all architectures.
The developers are proud to present this release to the community and we believe this represents the starting point for a true renaissance for Gridcoin!

Summary Changelog

Accrual

Changed

Most significantly, nodes calculate research rewards directly from the magnitudes in EACH superblock between stakes instead of using a two- or three- point average based on a CPID's current magnitude and the magnitude for the CPID when it last staked. For those long-timers in the community, this has been referred to as "Superblock Windows," and was first done in proof-of-concept form by @denravonska.

Removed

Beacons

Added

Changed

Removed

Unaltered

As a reminder:

Superblocks

Added

Changed

Removed

Voting

Added

Changed

Removed

Detailed Changelog

[5.0.0.0] 2020-09-03, mandatory, "Fern"

Added

Changed

Removed

Fixed

submitted by jamescowens to gridcoin [link] [comments]

MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to emulation [link] [comments]

Possible additions to game?

So I’ve been playing for a good long while now and have a few ideas for anyone willing to read: constructive criticism welcomed. Maybe a dev will see this, hopefully, I love this game.
 —Combat utilities— 
-Acid grenades-similar to how caltrops work, throw for initial damage to local area with large acid pools left behind. I know chem pistols do this but I don’t usually have them on my build.
-Oil canisters/flammable liquid- again like caltrops but would would have a chance to cause a humanoid to “slip” reducing all remaining movement points by half while creating hazard that could be set on fire by normal explosions.
-Claymores-the land mine not the sword. Directional explosion trigger by up to 2 blocks away (frag and hi explosive) that would create a arc of damage similar to how shotguns work.
-Remote controlled explosives- setup like c4 but could be remotely detonated, number of explosives place linked to intelligence/trap skill.
-Gas Grenades- in addition to the existing ones, the new varieties could be crafted from existing poisons used in normal crafting. Would “burst” AoE instead of creating a cloud, think poison flash bangs.
-Throwing javelin/axes-similar to throwing knives but higher damage/high weight/strength req to use. Javelins could be crafted with micro discharges for use against robots and axes with serrated edges for bleed damage.
-Explosive bolts-would fire a bolt that would penetrate target then detonate a turn later, risk of enemy closing safe distance before explosion could injury player. Damage would bypass shields (if it hits) and mechanical threshold. Especially effective against robots and turrets.
-Tungsten tips for bolts, bypass damage threshold while reducing effective range.
-contaminated bolts, crafted similar to how gas grenades are made, can “splash” effect on nearby enemies along with main target.
-Strobe light- similar to lamps, would create pulsating directional effect relative to the players forward perspective up to minimal range that would reduce enemy ranged accuracy, might scare critters. Offset but high energy cost, low battery store.
-Ranged taser- similar to current taser but would have a small (2-3 block) range with low accuracy/damage. Usable against humans and some critters. Ammo would have to be crafted along with charging the battery. Gun skill dependent.
-Trip mines- crafted from a bundle of existing and explosive hand grenades but placement would involve a double click action to first set up mine then the short trip wire to a second location. High chance of detection by enemies/chance to fail. Would make finding low level grenades useful in late game.
-Bouncing Betty mine-frag grenade variant with high chance of critical hit but short enemies (critters and such) immune.
-Distracting grenades-no damage or effect but could be used to lure enemies away. 2 turn effect.
-Hand held fuel torch- combat effect would be similar to existing taser but with no stun effect and would bypass resistances with thermal damage, out of combat could be used to cut open doors/locks. Dependent on chemistry/lock picking skill. Chance to destroy items if used on boxes. Refilled using crafted fuel cells with gas cans/oxygen canisters.
-Pneumatic injector-could be crafted/reloaded with poisons/chemicals for close range effect of throwing/bolt varieties. Useful for melee characters.
-White phosphorus grenades- similar to gas grenades but would burst out a cloud of smoke reducing hit chance within the effected area, a few burning bits of phosphorus could apply burn affect.
 —Weapons upgrades— —Sub machine guns— 
—add one extra attachment slot for all weapons—
-add a “double mag” attachment reducing AP for reloading.
-add stock attachment increasing precision and range at the cost of AP increase.
-add “light weight bolt carrier” attachment reducing burst AP cost slightly.
-add “heavy weight Bolt carrier” for a increase in precision but reducing number of rounds per burst.
-add “extended barrel” for increase range/precision for noticeable increase in AP cost/decrease burst precision.
 —Assault rifles— 
—add “suppressor” option for 9mm variants—
-add “extended barrel” for increase range/precision for noticeable increase in AP cost/decrease burst precision.
-add “tuned fire control group” for increase in burst accuracy/reduced AP cost
-add “drum mag” attachment for massive increase in ammo count but penalties to move and shoot precision.
-add “binary fire control group” attachment to allow two shots during normal shooting with small penalty to precision.
-add “magazine restriction” attachment for reduced ammo count but reduced move and shoot penalty.
 —Sniper rifles— 
—add “suppressor” option for 7.62 variants—
-add “scram rail” attachment which would electromagnetically accelerate projectiles for increase precision but requires weapon to be charge with batteries (low charge capacity) Drained battery would dramatically reduced precision. Unable to attach barrel attachments.
-add “heavy barrel” attachment for increased precision for shooting for a increase in move and shoot precision penalties.
-add “range finder” attachment for massively increased precision out of combat (first shot guaranteed)
Shotguns: —add one additional attachment slot for shotgun—
-Add “Ported barrel” variants for short and long barrels for increased precision and slightly reduced AP costs.
-Add “shell holder” attachment for massively reducing AP cost for regular pump shotguns (once per engagement)
-Add “long barrel” attachment for increase in range and precision at the cost of AP per shot, reduced burst fire precision for combat shotguns.
-Add “cut off stock” attachment for pump shotguns removing move and shoot penalties but reducing range while reducing AP costs as well.
-Add “rotary magazine tube assembly” for combat shotguns to massively increase mag size for equally massive AP cost for reloading (one reloaded cycle only fills half mag).
-Add “pneumatic reloaded” attachment from regular firearms to shotguns for decrease in pump shotgun AP cost per shot. Add “rapid reloader” attachment from regular firearms to combat shotguns to decrease AP cost per shot.
 —Crossbows— 
—add one additional attachment slot per weapon—
-Add “induction coil assembly” attachment, causes regular bolts to be super heated up upon firing causing a small amount of thermal damage in addition to normal damage. Weapon must be charged with batteries prior to use but no negative effect if not charged before firing.
-Add “triple bolt” attachment, allows three bolts to be fired in a tight spread with reduced precision but unable to fire special bolts or use special abilities such as aimed shot.
-Add “compound string assembly” attachment, dramatically increases precision/damage/range at the cost of higher AP cost per shot.
-Add “launcher assembly” attachment, allows normal grenades to be fired from crossbow, replaces normal bolts/special bolts as ammunition. Longer range and precision for grenades. Useful for players that have versatility but not specializing in crossbows in general. Higher AP cost and is not affected by talents that reduce grenade cool downs. Only for lvl 2 grenades.
 —random changes— 
-get rid of 20p shotgun shells, they are useless on most enemies anyway, replace with dragons breath shells for heavily reduced range but can cause burning.
-add the option for carrier vests to use leather hides as a component, ie hopper leather to add agility.
submitted by FreckledFury86 to underrail [link] [comments]

AJ ALMENDINGER

glimpse into the future of Roblox

Our vision to bring the world together through play has never been more relevant than it is now. As our founder and CEO, David Baszucki (a.k.a. Builderman), mentioned in his keynote, more and more people are using Roblox to stay connected with their friends and loved ones. He hinted at a future where, with our automatic machine translation technology, Roblox will one day act as a universal translator, enabling people from different cultures and backgrounds to connect and learn from each other.
During his keynote, Builderman also elaborated upon our vision to build the Metaverse; the future of avatar creation on the platform (infinitely customizable avatars that allow any body, any clothing, and any animation to come together seamlessly); more personalized game discovery; and simulating large social gatherings (like concerts, graduations, conferences, etc.) with tens of thousands of participants all in one server. We’re still very early on in this journey, but if these past five months have shown us anything, it’s clear that there is a growing need for human co-experience platforms like Roblox that allow people to play, create, learn, work, and share experiences together in a safe, civil 3D immersive space.
Up next, our VP of Developer Relations, Matt Curtis (a.k.a. m4rrh3w), shared an update on all the things we’re doing to continue empowering developers to create innovative and exciting content through collaboration, support, and expertise. He also highlighted some of the impressive milestones our creator community has achieved since last year’s RDC. Here are a few key takeaways:
And lastly, our VP of Engineering, Technology, Adam Miller (a.k.a. rbadam), unveiled a myriad of cool and upcoming features developers will someday be able to sink their teeth into. We saw a glimpse of procedural skies, skinned meshes, more high-quality materials, new terrain types, more fonts in Studio, a new asset type for in-game videos, haptic feedback on mobile, real-time CSG operations, and many more awesome tools that will unlock the potential for even bigger, more immersive experiences on Roblox.

Vibin’

Despite the virtual setting, RDC just wouldn’t have been the same without any fun party activities and networking opportunities. So, we invited special guests DJ Hyper Potions and cyber mentalist Colin Cloud for some truly awesome, truly mind-bending entertainment. Yoga instructor Erin Gilmore also swung by to inspire attendees to get out of their chair and get their body moving. And of course, we even had virtual rooms dedicated to karaoke and head-to-head social games, like trivia and Pictionary.
Over on the networking side, Team Adopt Me, Red Manta, StyLiS Studios, and Summit Studios hosted a virtual booth for attendees to ask questions, submit resumes, and more. We also had a networking session where three participants would be randomly grouped together to get to know each other.

What does Roblox mean to you?

We all know how talented the Roblox community is from your creations. We’ve heard plenty of stories over the years about how Roblox has touched your lives, how you’ve made friendships, learned new skills, or simply found a place where you can be yourself. We wanted to hear more. So, we asked attendees: What does Roblox mean to you? How has Roblox connected you? How has Roblox changed your life? Then, over the course of RDC, we incorporated your responses into this awesome mural.
📷
Created by Alece Birnbach at Graphic Recording Studio

Knowledge is power

This year’s breakout sessions included presentations from Roblox developers and staff members on the latest game development strategies, a deep dive into the Roblox engine, learning how to animate with Blender, tools for working together in teams, building performant game worlds, and the new Creator Dashboard. Dr. Michael Rich, Associate Professor at Harvard Medical School and Physician at Boston Children’s Hospital, also led attendees through a discussion on mental health and how to best take care of you and your friends’ emotional well-being, especially now during these challenging times.
📷
Making the Dream Work with Teamwork (presented by Roblox developer Myzta)
In addition to our traditional Q&A panel with top product and engineering leaders at Roblox, we also held a special session with Builderman himself to answer the community’s biggest questions.
📷
Roblox Product and Engineering Q&A Panel

2020 Game Jam

The Game Jam is always one of our favorite events of RDC. It’s a chance for folks to come together, flex their development skills, and come up with wildly inventive game ideas that really push the boundaries of what’s possible on Roblox. We had over 60 submissions this year—a new RDC record.
Once again, teams of up to six people from around the world had less than 24 hours to conceptualize, design, and publish a game based on the theme “2020 Vision,” all while working remotely no less! To achieve such a feat is nothing short of awe-inspiring, but as always, our dev community was more than up for the challenge. I’ve got to say, these were some of the finest creations we’ve seen.
WINNERS
Best in Show: Shapescape Created By: GhettoMilkMan, dayzeedog, maplestick, theloudscream, Brick_man, ilyannna You awaken in a strange laboratory, seemingly with no way out. Using a pair of special glasses, players must solve a series of anamorphic puzzles and optical illusions to make their escape.
Excellence in Visual Art: agn●sia Created By: boatbomber, thisfall, Elttob An obby experience unlike any other, this game is all about seeing the world through a different lens. Reveal platforms by switching between different colored lenses and make your way to the end.
Most Creative Gameplay: Visions of a perspective reality Created By: Noble_Draconian and Spathi Sometimes all it takes is a change in perspective to solve challenges. By switching between 2D and 3D perspectives, players can maneuver around obstacles or find new ways to reach the end of each level.
Outstanding Use of Tech: The Eyes of Providence Created By: Quenty, Arch_Mage, AlgyLacey, xJennyBeanx, Zomebody, Crykee This action/strategy game comes with a unique VR twist. While teams fight to construct the superior monument, two VR players can support their minions by collecting resources and manipulating the map.
Best Use of Theme: Sticker Situation Created By: dragonfrosting and Yozoh Set in a mysterious art gallery, players must solve puzzles by manipulating the environment using a magic camera and stickers. Snap a photograph, place down a sticker, and see how it changes the world.
OTHER TOP PICKS
HONORABLE MENTIONS
For the rest of the 2020 Game Jam submissions, check out the list below:
20-20 Vision | 20/20 Vision | 2020 Vision, A Crazy Perspective | 2020 Vision: Nyon | A Wild Trip! | Acuity | Best Year Ever | Better Half | Bloxlabs | Climb Stairs to 2021 | Double Vision (Team hey apple) | Eyebrawl | Eyeworm Exam | FIRE 2020 | HACKED | Hyperspective | Lucid Scream | Mystery Mansion | New Years at the Museum | New Year’s Bash | Poor Vision | Predict 2020 | RBC News | Retrovertigo | Second Wave | see no evil | Sight Fight | Sight Stealers | Spectacles Struggle | Specter Spectrum | Survive 2020 | The Lost Chicken Leg | The Outbreak | The Spyglass | Time Heist | Tunnel Vision | Virtual RDC – The Story | Vision (Team Freepunk) | Vision (Team VIP People ####) | Vision Developers Conference 2020 | Vision Is Key | Vision Perspective | Vision Racer | Visions | Zepto
And last but not least, we wanted to give a special shout out to Starboard Studios. Though they didn’t quite make it on time for our judges, we just had to include Dave’s Vision for good measure. 📷
Thanks to everyone who participated in the Game Jam, and congrats to all those who took home the dub in each of our categories this year. As the winners of Best in Show, the developers of Shapescape will have their names forever engraved on the RDC Game Jam trophy back at Roblox HQ. Great work!

‘Til next year

And that about wraps up our coverage of the first-ever digital RDC. Thanks to all who attended! Before we go, we wanted to share a special “behind the scenes” video from the 2020 RDC photoshoot.
Check it out:
It was absolutely bonkers. Getting 350 of us all in one server was so much fun and really brought back the feeling of being together with everyone again. That being said, we can’t wait to see you all—for real this time—at RDC next year. It’s going to be well worth the wait. ‘Til we meet again, my friends.
© 2020 Roblox Corporation. All Rights Reserved.

Improving Simulation and Performance with an Advanced Physics Solver

August

05, 2020

by chefdeletat
PRODUCT & TECH
📷In mid-2015, Roblox unveiled a major upgrade to its physics engine: the Projected Gauss-Seidel (PGS) physics solver. For the first year, the new solver was optional and provided improved fidelity and greater performance compared to the previously used spring solver.
In 2016, we added support for a diverse set of new physics constraints, incentivizing developers to migrate to the new solver and extending the creative capabilities of the physics engine. Any new places used the PGS solver by default, with the option of reverting back to the classic solver.
We ironed out some stability issues associated with high mass differences and complex mechanisms by the introduction of the hybrid LDL-PGS solver in mid-2018. This made the old solver obsolete, and it was completely disabled in 2019, automatically migrating all places to the PGS.
In 2019, the performance was further improved using multi-threading that splits the simulation into jobs consisting of connected islands of simulating parts. We still had performance issues related to the LDL that we finally resolved in early 2020.
The physics engine is still being improved and optimized for performance, and we plan on adding new features for the foreseeable future.

Implementing the Laws of Physics

📷
The main objective of a physics engine is to simulate the motion of bodies in a virtual environment. In our physics engine, we care about bodies that are rigid, that collide and have constraints with each other.
A physics engine is organized into two phases: collision detection and solving. Collision detection finds intersections between geometries associated with the rigid bodies, generating appropriate collision information such as collision points, normals and penetration depths. Then a solver updates the motion of rigid bodies under the influence of the collisions that were detected and constraints that were provided by the user.
📷
The motion is the result of the solver interpreting the laws of physics, such as conservation of energy and momentum. But doing this 100% accurately is prohibitively expensive, and the trick to simulating it in real-time is to approximate to increase performance, as long as the result is physically realistic. As long as the basic laws of motion are maintained within a reasonable tolerance, this tradeoff is completely acceptable for a computer game simulation.

Taking Small Steps

The main idea of the physics engine is to discretize the motion using time-stepping. The equations of motion of constrained and unconstrained rigid bodies are very difficult to integrate directly and accurately. The discretization subdivides the motion into small time increments, where the equations are simplified and linearized making it possible to solve them approximately. This means that during each time step the motion of the relevant parts of rigid bodies that are involved in a constraint is linearly approximated.
📷📷
Although a linearized problem is easier to solve, it produces drift in a simulation containing non-linear behaviors, like rotational motion. Later we’ll see mitigation methods that help reduce the drift and make the simulation more plausible.

Solving

📷
Having linearized the equations of motion for a time step, we end up needing to solve a linear system or linear complementarity problem (LCP). These systems can be arbitrarily large and can still be quite expensive to solve exactly. Again the trick is to find an approximate solution using a faster method. A modern method to approximately solve an LCP with good convergence properties is the Projected Gauss-Seidel (PGS). It is an iterative method, meaning that with each iteration the approximate solution is brought closer to the true solution, and its final accuracy depends on the number of iterations.
📷
This animation shows how a PGS solver changes the positions of the bodies at each step of the iteration process, the objective being to find the positions that respect the ball and socket constraints while preserving the center of mass at each step (this is a type of positional solver used by the IK dragger). Although this example has a simple analytical solution, it’s a good demonstration of the idea behind the PGS. At each step, the solver fixes one of the constraints and lets the other be violated. After a few iterations, the bodies are very close to their correct positions. A characteristic of this method is how some rigid bodies seem to vibrate around their final position, especially when coupling interactions with heavier bodies. If we don’t do enough iterations, the yellow part might be left in a visibly invalid state where one of its two constraints is dramatically violated. This is called the high mass ratio problem, and it has been the bane of physics engines as it causes instabilities and explosions. If we do too many iterations, the solver becomes too slow, if we don’t it becomes unstable. Balancing the two sides has been a painful and long process.

Mitigation Strategies

📷A solver has two major sources of inaccuracies: time-stepping and iterative solving (there is also floating point drift but it’s minor compared to the first two). These inaccuracies introduce errors in the simulation causing it to drift from the correct path. Some of this drift is tolerable like slightly different velocities or energy loss, but some are not like instabilities, large energy gains or dislocated constraints.
Therefore a lot of the complexity in the solver comes from the implementation of methods to minimize the impact of computational inaccuracies. Our final implementation uses some traditional and some novel mitigation strategies:
  1. Warm starting: starting with the solution from a previous time-step to increase the convergence rate of the iterative solver
  2. Post-stabilization: reprojecting the system back to the constraint manifold to prevent constraint drift
  3. Regularization: adding compliance to the constraints ensuring a solution exists and is unique
  4. Pre-conditioning: using an exact solution to a linear subsystem, improving the stability of complex mechanisms
Strategies 1, 2 and 3 are pretty traditional, but 3 has been improved and perfected by us. Also, although 4 is not unheard of, we haven’t seen any practical implementation of it. We use an original factorization method for large sparse constraint matrices and a new efficient way of combining it with the PGS. The resulting implementation is only slightly slower compared to pure PGS but ensures that the linear system coming from equality constraints is solved exactly. Consequently, the equality constraints suffer only from drift coming from the time discretization. Details on our methods are contained in my GDC 2020 presentation. Currently, we are investigating direct methods applied to inequality constraints and collisions.

Getting More Details

Traditionally there are two mathematical models for articulated mechanisms: there are reduced coordinate methods spearheaded by Featherstone, that parametrize the degrees of freedom at each joint, and there are full coordinate methods that use a Lagrangian formulation.
We use the second formulation as it is less restrictive and requires much simpler mathematics and implementation.
The Roblox engine uses analytical methods to compute the dynamic response of constraints, as opposed to penalty methods that were used before. Analytics methods were initially introduced in Baraff 1989, where they are used to treat both equality and non-equality constraints in a consistent manner. Baraff observed that the contact model can be formulated using quadratic programming, and he provided a heuristic solution method (which is not the method we use in our solver).
Instead of using force-based formulation, we use an impulse-based formulation in velocity space, originally introduced by Mirtich-Canny 1995 and further improved by Stewart-Trinkle 1996, which unifies the treatment of different contact types and guarantees the existence of a solution for contacts with friction. At each timestep, the constraints and collisions are maintained by applying instantaneous changes in velocities due to constraint impulses. An excellent explanation of why impulse-based simulation is superior is contained in the GDC presentation of Catto 2014.
The frictionless contacts are modeled using a linear complementarity problem (LCP) as described in Baraff 1994. Friction is added as a non-linear projection onto the friction cone, interleaved with the iterations of the Projected Gauss-Seidel.
The numerical drift that introduces positional errors in the constraints is resolved using a post-stabilization technique using pseudo-velocities introduced by Cline-Pai 2003. It involves solving a second LCP in the position space, which projects the system back to the constraint manifold.
The LCPs are solved using a PGS / Impulse Solver popularized by Catto 2005 (also see Catto 2009). This method is iterative and considers each individual constraints in sequence and resolves it independently. Over many iterations, and in ideal conditions, the system converges to a global solution.
Additionally, high mass ratio issues in equality constraints are ironed out by preconditioning the PGS using the sparse LDL decomposition of the constraint matrix of equality constraints. Dense submatrices of the constraint matrix are sparsified using a method we call Body Splitting. This is similar to the LDL decomposition used in Baraff 1996, but allows more general mechanical systems, and solves the system in constraint space. For more information, you can see my GDC 2020 presentation.
The architecture of our solver follows the idea of Guendelman-Bridson-Fedkiw, where the velocity and position stepping are separated by the constraint resolution. Our time sequencing is:
  1. Advance velocities
  2. Constraint resolution in velocity space and position space
  3. Advance positions
This scheme has the advantage of integrating only valid velocities, and limiting latency in external force application but allowing a small amount of perceived constraint violation due to numerical drift.
An excellent reference for rigid body simulation is the book Erleben 2005 that was recently made freely available. You can find online lectures about physics-based animation, a blog by Nilson Souto on building a physics engine, a very good GDC presentation by Erin Catto on modern solver methods, and forums like the Bullet Physics Forum and GameDev which are excellent places to ask questions.

In Conclusion

The field of game physics simulation presents many interesting problems that are both exciting and challenging. There are opportunities to learn a substantial amount of cool mathematics and physics and to use modern optimizations techniques. It’s an area of game development that tightly marries mathematics, physics and software engineering.
Even if Roblox has a good rigid body physics engine, there are areas where it can be improved and optimized. Also, we are working on exciting new projects like fracturing, deformation, softbody, cloth, aerodynamics and water simulation.
Neither Roblox Corporation nor this blog endorses or supports any company or service. Also, no guarantees or promises are made regarding the accuracy, reliability or completeness of the information contained in this blog.
This blog post was originally published on the Roblox Tech Blog.
© 2020 Roblox Corporation. All Rights Reserved.

Using Clang to Minimize Global Variable Use

July

23, 2020

by RandomTruffle
PRODUCT & TECH
Every non-trivial program has at least some amount of global state, but too much can be a bad thing. In C++ (which constitutes close to 100% of Roblox’s engine code) this global state is initialized before main() and destroyed after returning from main(), and this happens in a mostly non-deterministic order. In addition to leading to confusing startup and shutdown semantics that are difficult to reason about (or change), it can also lead to severe instability.
Roblox code also creates a lot of long-running detached threads (threads which are never joined and just run until they decide to stop, which might be never). These two things together have a very serious negative interaction on shutdown, because long-running threads continue accessing the global state that is being destroyed. This can lead to elevated crash rates, test suite flakiness, and just general instability.
The first step to digging yourself out of a mess like this is to understand the extent of the problem, so in this post I’m going to talk about one technique you can use to gain visibility into your global startup flow. I’m also going to discuss how we are using this to improve stability across the entire Roblox game engine platform by decreasing our use of global variables.

Introducing -finstrument-functions

Nothing excites me more than learning about a new obscure compiler option that I’ve never had a use for before, so I was pretty happy when a colleague pointed me to this option in the Clang Command Line Reference. I’d never used it before, but it sounded very cool. The idea being that if we could get the compiler to tell us every time it entered and exited a function, we could filter this information through a symbolizer of some kind and generate a report of functions that a) occur before main(), and b) are the very first function in the call-stack (indicating it’s a global).
Unfortunately, the documentation basically just tells you that the option exists with no mention of how to use it or if it even actually does what it sounds like it does. There’s also two different options that sound similar to each other (-finstrument-functions and -finstrument-functions-after-inlining), and I still wasn’t entirely sure what the difference was. So I decided to throw up a quick sample on godbolt to see what happened, which you can see here. Note there are two assembly outputs for the same source listing. One uses the first option and the other uses the second option, and we can compare the assembly output to understand the differences. We can gather a few takeaways from this sample:
  1. The compiler is injecting calls to __cyg_profile_func_enter and __cyg_profile_func_exit inside of every function, inline or not.
  2. The only difference between the two options occurs at the call-site of an inline function.
  3. With -finstrument-functions, the instrumentation for the inlined function is inserted at the call-site, whereas with -finstrument-functions-after-inlining we only have instrumentation for the outer function. This means that when using-finstrument-functions-after-inlining you won’t be able to determine which functions are inlined and where.
Of course, this sounds exactly like what the documentation said it did, but sometimes you just need to look under the hood to convince yourself.
To put all of this another way, if we want to know about calls to inline functions in this trace we need to use -finstrument-functions because otherwise their instrumentation is silently removed by the compiler. Sadly, I was never able to get -finstrument-functions to work on a real example. I would always end up with linker errors deep in the Standard C++ Library which I was unable to figure out. My best guess is that inlining is often a heuristic, and this can somehow lead to subtle ODR (one-definition rule) violations when the optimizer makes different inlining decisions from different translation units. Luckily global constructors (which is what we care about) cannot possibly be inlined anyway, so this wasn’t a problem.
I suppose I should also mention that I still got tons of linker errors with -finstrument-functions-after-inlining as well, but I did figure those out. As best as I can tell, this option seems to imply –whole-archive linker semantics. Discussion of –whole-archive is outside the scope of this blog post, but suffice it to say that I fixed it by using linker groups (e.g. -Wl,–start-group and -Wl,–end-group) on the compiler command line. I was a bit surprised that we didn’t get these same linker errors without this option and still don’t totally understand why. If you happen to know why this option would change linker semantics, please let me know in the comments!

Implementing the Callback Hooks

If you’re astute, you may be wondering what in the world __cyg_profile_func_enter and __cyg_profile_func_exit are and why the program is even successfully linking in the first without giving undefined symbol reference errors, since the compiler is apparently trying to call some function we’ve never defined. Luckily, there are some options that allow us to see inside the linker’s algorithm so we can find out where it’s getting this symbol from to begin with. Specifically, -y should tell us how the linker is resolving . We’ll try it with a dummy program first and a symbol that we’ve defined ourselves, then we’ll try it with __cyg_profile_func_enter .
[email protected]:~/src/sandbox$ cat instr.cpp int main() {} [email protected]:~/src/sandbox$ clang++-9 -fuse-ld=lld -Wl,-y -Wl,main instr.cpp /usbin/../lib/gcc/x86_64-linux-gnu/crt1.o: reference to main /tmp/instr-5b6c60.o: definition of main
No surprises here. The C Runtime Library references main(), and our object file defines it. Now let’s see what happens with __cyg_profile_func_enter and -finstrument-functions-after-inlining.
[email protected]:~/src/sandbox$ clang++-9 -fuse-ld=lld -finstrument-functions-after-inlining -Wl,-y -Wl,__cyg_profile_func_enter instr.cpp /tmp/instr-8157b3.o: reference to __cyg_profile_func_enter /lib/x86_64-linux-gnu/libc.so.6: shared definition of __cyg_profile_func_enter
Now, we see that libc provides the definition, and our object file references it. Linking works a bit differently on Unix-y platforms than it does on Windows, but basically this means that if we define this function ourselves in our cpp file, the linker will just automatically prefer it over the shared library version. Working godbolt link without runtime output is here. So now you can kind of see where this is going, however there are still a couple of problems left to solve.
  1. We don’t want to do this for a full run of the program. We want to stop as soon as we reach main.
  2. We need a way to symbolize this trace.
The first problem is easy to solve. All we need to do is compare the address of the function being called to the address of main, and set a flag indicating we should stop tracing henceforth. (Note that taking the address of main is undefined behavior[1], but for our purposes it gets the job done, and we aren’t shipping this code, so ¯\_(ツ)_/¯). The second problem probably deserves a little more discussion though.

Symbolizing the Traces

In order to symbolize these traces, we need two things. First, we need to store the trace somewhere on persistent storage. We can’t expect to symbolize in real time with any kind of reasonable performance. You can write some C code to save the trace to some magic filename, or you can do what I did and just write it to stderr (this way you can pipe stderr to some file when you run it).
Second, and perhaps more importantly, for every address we need to write out the full path to the module the address belongs to. Your program loads many shared libraries, and in order to translate an address into a symbol, we have to know which shared library or executable the address actually belongs to. In addition, we have to be careful to write out the address of the symbol in the file on disk. When your program is running, the operating system could have loaded it anywhere in memory. And if we’re going to symbolize it after the fact we need to make sure we can still reference it after the information about where it was loaded in memory is lost. The linux function dladdr() gives us both pieces of information we need. A working godbolt sample with the exact implementation of our instrumentation hooks as they appear in our codebase can be found here.

Putting it All Together

Now that we have a file in this format saved on disk, all we need to do is symbolize the addresses. addr2line is one option, but I went with llvm-symbolizer as I find it more robust. I wrote a Python script to parse the file and symbolize each address, then print it in the same “visual” hierarchical format that the original output file is in. There are various options for filtering the resulting symbol list so that you can clean up the output to include only things that are interesting for your case. For example, I filtered out any globals that have boost:: in their name, because I can’t exactly go rewrite boost to not use global variables.
The script isn’t as simple as you would think, because simply crawling each line and symbolizing it would be unacceptably slow (when I tried this, it took over 2 hours before I finally killed the process). This is because the same address might appear thousands of times, and there’s no reason to run llvm-symbolizer against the same address multiple times. So there’s a lot of smarts in there to pre-process the address list and eliminate duplicates. I won’t discuss the implementation in more detail because it isn’t super interesting. But I’ll do even better and provide the source!
So after all of this, we can run any one of our internal targets to get the call tree, run it through the script, and then get output like this (actual output from a Roblox process, source file information removed):
excluded_symbols = [‘.\boost.*’]* excluded_modules = [‘/usr.\’]* /uslib/x86_64-linux-gnu/libLLVM-9.so.1: 140 unique addresses InterestingRobloxProcess: 38928 unique addresses /uslib/x86_64-linux-gnu/libstdc++.so.6: 1 unique addresses /uslib/x86_64-linux-gnu/libc++.so.1: 3 unique addresses Printing call tree with depth 2 for 29276 global variables. __cxx_global_var_init.5 (InterestingFile1.cpp:418:22) RBX::InterestingRobloxClass2::InterestingRobloxClass2() (InterestingFile2.cpp.:415:0) __cxx_global_var_init.19 (InterestingFile2.cpp:183:34) (anonymous namespace)::InterestingRobloxClass2::InterestingRobloxClass2() (InterestingFile2.cpp:171:0) __cxx_global_var_init.274 (InterestingFile3.cpp:2364:33) RBX::InterestingRobloxClass3::InterestingRobloxClass3()
So there you have it: the first half of the battle is over. I can run this script on every platform, compare results to understand what order our globals are actually initialized in in practice, then slowly migrate this code out of global initializers and into main where it can be deterministic and explicit.

Future Work

It occurred to me sometime after implementing this that we could make a general purpose profiling hook that exposed some public symbols (dllexport’ed if you speak Windows), and allowed a plugin module to hook into this dynamically. This plugin module could filter addresses using whatever arbitrary logic that it was interested in. One interesting use case I came up for this is that it could look up the debug information, check if the current address maps to the constructor of a function local static, and write out the address if so. This effectively allows us to gain a deeper understanding of the order in which our lazy statics are initialized. The possibilities are endless here.

Further Reading

If you’re interested in this kind of thing, I’ve collected a couple of my favorite references for this kind of topic.
  1. Various: The C++ Language Standard
  2. Matt Godbolt: The Bits Between the Bits: How We Get to main()
  3. Ryan O’Neill: Learning Linux Binary Analysis
  4. Linkers and Loaders: John R. Levine
  5. https://eel.is/c++draft/basic.exec#basic.start.main-3
Neither Roblox Corporation nor this blog endorses or supports any company or service. Also, no guarantees or promises are made regarding the accuracy, reliability or completeness of the information contained in this blog.
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Cryptosoft Review 2020-Is it a Scam?

Cryptosoft Review 2020-Is it a Scam?

Most f the reviews we tend to have come back across reveal that the Cryptp soft platform is easy to
Their client service is very efficient. We did a live check and confirmed that they respond at intervals a moment. Moreover, they are available 24/7.
The Cryptp soft app is secure. They need all the mandatory measures in place to make sure data privacy.
The Cryptp soft System is considered by several among the most effective robots within the market nowadays. We have a tendency to realize this robot to perform virtually the same with Bitcoin Rush, another top bitcoin robot. Read the review of Bitcoin Rush for more data?
Cryptp soft registration method is straightforward, easy, and secure. You only want but 10 minutes to form an account and begin trading. Cryptp soft is a absolutely auto bot and is so accessible to everyone.

https://preview.redd.it/giu6kclgfnn51.jpg?width=1280&format=pjpg&auto=webp&s=f605d84ba2174f831ca825dbaffddf061b3a55b5
You do not want to perceive trading lingo to use Immediate Edge. The following steps can get you started with this robot.
STEP ONE: Fill the Signup type

Visit the Cryptp soft home page and register your name, phone number, and email in the provided kind. You will be asked to verify your phone variety via a text code and email through a link. CryptoVibes will ascertain that the Cryptp soft registration process is secure.

Their web site is SSL secured to confirm that hackers cannot steal personal information submitted through it. Cryptp soft cyber safety policy states that they're GDPR adherent. This suggests that they handle your knowledge with strict privacy.
STEP TWO: Get matched with a broker

The Cryptp soft Software then matches you with one in every of their partner brokers. The role of the broker is to receive deposits and facilitate transactions. We have a tendency to have determined that Cryptp soft only partners with regulated brokers.

With a regulated broker, they guarantee that your cash is safe. Reputable regulators such as the FCA, FSB, ASIC, and CySEC need brokers to segregate deposits and submit periodic reports on deposit usage.
You wold like a deposit of a minimum of $250 to trade with Immediate Edge. Do not confuse this quantity with the value of the robot. Cryptp soft does not need any license fee. The house owners of this robot build money by charging a small commission on the profits generated through the app
Deposits with Cryptp soft should be created through Wire Transfer, Visa, and MasterCard. It takes a few seconds for a deposit to reflect in an exceedingly trader’s account. Cryptp soft does not charge any deposit fees.
The Cryptp soft does provide a demo account to help traders familiarize themselves with its web-trader. CryptoVibes recommends that you are doing demo trading before going to live to trade. Please note that the demo is for demonstrative purposes solely.
The results you receive on the platform are primarily based on historical information and could therefore not mirror what you'll get in live trading.
The Cryptp soft live trader comes with features to help you outline the amount of risk you are willing to require per trade. You wish to go through the demo account to familiarize with these features. As mentioned severally in this review, you do not want specialized skills to use this robot.
Live trading with Cryptp soft involves determining the quantity of capital you plan to risk per trade and clicking the live button. Scan our review of Bitcoin Trader for one more straightforward to use the robot.
*Remember all trading risks and you shouldn’t risk more then you'll be able to afford to lose.
How to get the most out of Cryptp soft App
We have identified the following tips as paramount in guaranteeing that you make the most of Immediate Edge.
Begin with a deposit of $250 – Given the level of risk involved in trading with Immediate Edge, you should start with a tiny investment.
Follow crypto market news – You need to determine the type of reports that drives volatility high and capitalize on them. Cryptp soft claims to form the foremost profits throughout high market volatility.
Trade for eight hours per day – In keeping with Immediate Edge, trading for at least eight hours per day can help maximize profits. Cryptp soft is entirely auto, and hence you'll be able to leave the robot running as you continue together with your daily errands. You are doing not want more than twenty minutes per day to observe your account.
Close trading sessions at the tip of the day – Leaving open positions overnight is doubtless to translate to losses since the markets can change considerably overnight. It is better to shut sessions even if in the negative and start trading again the subsequent day. With a correct risk management strategy, there is no would like to fret concerning periodic losses.
Following our review we tend to realize Cryptp soft to be legit. But, traders ought to take additional caution, provided that this bot comes at a degree of risk. Whereas the app claims it's potential to form profits of up to 50percent per day, you'll be able to additionally lose the complete deposit inside seconds. This is often not sudden for a high-frequency trading robot.
We recommend that you just apply the required risk management measures. As a rule of thumb don't risk more than 10percent of your trading capital per trade. Also, never trade with an amount you cannot afford to lose. It is prudent to start small and add cash as you get conversant with the various features on the platform.
Recently, a brand new trading software was added to the bitcoin investment trade. This software is termed Cryptp soft and it is allegedly created by a corporation or organization called the International Council for Bitcoin.
There is additionally a letter out there on their web site that has been signed by someone named David. This person claims to own earned over 1,000,000 as a results of investing in bitcoins. What’s very shocking concerning this letter is that David claims to have earned that huge quantity in just one trade. If we have a tendency to place it in simple words, David became a millionaire overnight.
We tend to highly doubt that a trading system that has been launched recently will have such potential. To verify the main points of this software and to determine its legitimacy, we have a tendency to conducted our own research and investigation.
Cryptp soft is a bitcoin trading software that’s meant to assist newbie traders get involved in Cryptocurrency trading with less risk than ancient investment opportunities. Cryptp soft software was created by The International Council For Bitcoin who is PRO Bitcoin trader Group behind the Cryptp soft software. Notice out all concerning Cryptp soft software by The International Council For Bitcoin.
Cryptp soft Software may be a nice development by a famous, well established and experienced bitcoin trader Investors with a viewpoint to enable traders to perform different tasks with ease and convenience.

https://preview.redd.it/uuh85yghfnn51.png?width=1238&format=png&auto=webp&s=d0558e6e123114b6624d5a724b3b9b5983e717e1
Cryptp soft Software is essentially a Binary choices trading software that is designed to assist traders win and predict the Binary options trend of their respective choices. Cryptp soft APP works as a code to urge financial success, shows traders how they'll make money on-line, helps them to find different ways in which to induce huge returns on their investment. The Cryptp soft Trading Software additionally provides analyses of Market conditions so that traders will recognize what ought to be their next step. Cryptp soft System gives secret cryptocurrency ways that ultimately help binary traders to create thousands of greenbacks solely for some bucks.
Several individuals can say that Cryptocurrency Trading may be a risky business and tend to remain faraway from it. But from my expertise, high volatility means HIGH RETURN OF INVESTMENT in Crypto Market. But this can be where the Cryptp soft comes into play, the mathematical algorithm used by Cryptp soft Software takes the guesswork out choosing a winning profitable trade. You don’t must be an expert. Like I said earlier, I actually have personally tested the Cryptp soft and found the success rate is about ninety sevenpercent. I don’t apprehend concerning you, but a ninety seven% probability of earning a profitable trade is TERRIBLY GOOD! I’ve never come across something like this trading software before. Keep reading, below are my Cryptp soft results for the past week or so…
Watch over the Shoulder of a Professional Each Day and you'll be able to learn as you trade.
Averaging 97% Winning Weeks With Cryptp soft which suggests that more potential profits for you
Cryptp soft Software Are Fully Transparent
No previous experience with binary choices trading required
Web-based mostly, no need for downloads, additionally works on phones, tablets
You'll be able to Even Watch Cryptp soft Signals From Your Phone (iPhone Users — Photon Browser)
If you are ready to begin making cash online with an on the spot edge, there has never been a better chance than currently. If you enjoy surfing the web for countless hours trying for the next Trading Method Secrets, never being able to urge centered, being overloaded with conflicting information, and not creating cash on-line, you ought to probably leave this page right now and get back to that Cryptp soft System strategy
Cryptp soft bot could be a new cryptocurrency trading invention that comes with options that create this software stand out among others. It is conjointly an automatic trading platform that uses a smart program algorithm to detect favorable trading opportunities. It acts on its own or waits for a prompt command from the user depending on the software’s settings. But what makes this software unique and a favorite to individuals is what we have a tendency to shall unveil in this review.
There have been lots of unverified claims of how totally different cryptocurrency software have helped several people to make massive profits leading to Scam individuals. However, it's pertinent for cryptocurrency traders to verify if a particular trading software may be a scam or legit, which is also ?
After subjecting the features of the Cryptp soft bot software to a series of tests, the software isn't a scam however legit. The Cryptp soft bot is believed to have successful rate of 85%, that is a lot of than the 80percent benchmark for average software. The Cryptp soft bot has helped cryptocurrency traders to make sensible profits, which has been documented as testimonies on the software’s website.
Trading on the platform is straightforward and might not require experience. We had to verify the simplicity of the software, and we tend to discovered that the software is easy to navigate. The demo trading feature of the software makes it potential for brand new users to hold out trading activities in an exceedingly simulated atmosphere while not having to risk their investment. This any gives credence to the legitimacy of the software because it ensures that new users get accustomed to the features of the software before continuing to measure to trade
As earlier stated, the Cryptp soft bot could be a high-tech program software that comes with exceptional options that makes it among the simplest cryptocurrency trading software in the blockchain market. The outstanding features of the Cryptp soft bot embody the subsequent:
https://www.cryptoerapro.com/cryptosoft/

http://www.cryptoerapro.com/

https://twitter.com/cryptoerapro

https://www.instagram.com/cryptoerapro/

https://www.pinterest.co.uk/cryptoerapro/
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MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

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