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Atari 5200 #116547 12/06/19 03:56 PM
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Shoegazer Offline OP
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Somoene informed me recently of the issues with the mame a5200 driver, particularly games like galaxian with notable graphics problems. That surprised me given that the a2600 and a7800 drivers seem to be solid, at least when I last tested. They cited emulators such as kat5200 which don't seem to have such issues. Kat5200 is open-source and cross-platform, though given that it's under GPL3 I'm not sure if it's possible to port some elements of its codebase. Perhaps it could at least serve as a decent reference at some future point whenever driver work continues. I'm willing to bet any actual porting would not be simple, though the great work mooglyguy recently did with bsnes gives at least some hope.

Re: Atari 5200 [Re: Shoegazer] #116548 12/06/19 04:13 PM
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R. Belmont Offline
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5200 is, as most people know, an Atari 400/800 with less ports. Our Atari 400/800 emulation is well behind state-of-the-art, and no platform champion has appeared, unlike with many other older systems.

Re: Atari 5200 [Re: Shoegazer] #116549 12/06/19 04:26 PM
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Haze Offline
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Also MAME is NOT GPL3 compatible, putting GPL3 code in MAME would jeopardize the project.

Re: Atari 5200 [Re: Shoegazer] #116551 12/06/19 05:47 PM
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Shoegazer Offline OP
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Fair enough. While I haven't tested Atar800 as extensively, I know it's also a pretty solid emulator of the series, and is GPL2 as mentioned here. Not sure if that makes any difference but for what it's worth.

Re: Atari 5200 [Re: Shoegazer] #116552 12/06/19 06:33 PM
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Altirra is the current champ - it's approaching bsnes levels of accuracy.

Re: Atari 5200 [Re: Shoegazer] #116553 12/06/19 07:06 PM
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Shoegazer Offline OP
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Hmm yeah, but there's no support for linux sadly.

Re: Atari 5200 [Re: Shoegazer] #116554 12/06/19 11:29 PM
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robcfg Offline
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I tried Altirra some months ago, and my code was showing some glitches that I don't see on Atari800MacX, Mame or the real machine.

Re: Atari 5200 [Re: Shoegazer] #116555 12/07/19 10:05 PM
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Also, my porting of bsnes was specifically because byuu was willing to relicense those portions of the codebase as GPLv2+. The rest of the project is still GPLv3 and can't be ported into MAME.

Re: Atari 5200 [Re: Shoegazer] #116556 12/09/19 02:35 PM
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Shoegazer Offline OP
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Hey MG, that's okay. I was just happy you found a way to get what you did from byuu's project into MAME, we're definitely better off for it.

As the accuracy-focused "new kid on the block", I was hoping mesen-s would be v2 out of the gate but alas it's not. Not sure if sour would consider relicensing any of his code for MAME (or mesen for that matter) but would be nice if he did, assuming his C++/C# base would be a good fit.

Re: Atari 5200 [Re: Shoegazer] #116714 01/11/20 05:17 PM
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Did some more extensive plumbing of the a5200 driver with many titles in the softlist and found a good majority of them (maybe 75%) are way off, some unplayably broken. Even older versions of "Atari800 Emulator" emulate the same titles much better.

Checking mame's dev log, it seems the last time anyone did heavy lifting on the driver was back in the 0.36 era (Juergen Buchmueller - now there's a blast from the past). Given such history, as RB suggested a new challenger isn't likely to appear - so I'm wondering if consideration might be given to bump the driver status from good to imperfect or even preliminary? It may not be great in mame but at least it could be tagged appropriately.

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