Shannon Posted April 3, 2021 Share Posted April 3, 2021 (edited) Recently I've been trying out some recent homebrew on emulators and I've noticed some odd graphical glitches. I'm trying to figure out if it is an emulator issue or something else like cartridge headers. The emulators are. Emu7800 (retroarch) and a7800x ( Xbox emulator based on mess 7800 emulation ). The games are Chase Milli and Mollie Popeye Wizard Dungeon Thank you Edited April 3, 2021 by Shannon Quote Link to comment Share on other sites More sharing options...
Trebor Posted April 3, 2021 Share Posted April 3, 2021 4 hours ago, Shannon said: ...it is an emulator issue... ...Emu7800 (retroarch) and a7800x... Answered. Emu7800 (retroarch) is based on the antiquated ProSystem emulator's console emulation. a7800x is based on MAME(/MESS) 0.153, also outdated as far as 7800 console emulation accuracy and support. Quote Link to comment Share on other sites More sharing options...
Shannon Posted April 3, 2021 Author Share Posted April 3, 2021 ok thanks. I know they are dated but these are the first time that I've ever seen homebrew that have issues with them. Quote Link to comment Share on other sites More sharing options...
RevEng Posted April 3, 2021 Share Posted April 3, 2021 7800basic uses some stable-but-undocumented opcodes, to speed up it's sprite routines. This broke some of the emulators without complete 6502 implementations. 4 Quote Link to comment Share on other sites More sharing options...
Shannon Posted April 4, 2021 Author Share Posted April 4, 2021 6 hours ago, RevEng said: 7800basic uses some stable-but-undocumented opcodes, to speed up it's sprite routines. This broke some of the emulators without complete 6502 implementations. Thanks RevEng. I suspected that but I forgot to mention that possibility. I'm trying to figure out some way to run these on my mini console. I think I can use Mess/Mame but I'll have to edit an XML file and put some CRC's in it. Quote Link to comment Share on other sites More sharing options...
RevEng Posted April 4, 2021 Share Posted April 4, 2021 4 minutes ago, Shannon said: Thanks RevEng. I suspected that but I forgot to mention that possibility. I'm trying to figure out some way to run these on my mini console. I think I can use Mess/Mame but I'll have to edit an XML file and put some CRC's in it. It depends. If you're using a front-end or CLI, you can skip the CRCs. Something like "mame64 a7800 -cart /path/to/my.a78" works. 1 Quote Link to comment Share on other sites More sharing options...
Shannon Posted April 4, 2021 Author Share Posted April 4, 2021 (edited) Yeah sadly I'm limited to the retroarch implementation on the min consoles. So no parameter passing. Uggh... Mess needs headerless files. Popeye is not headerless. Isn't there some online tool to remove/add headers to 7800 ROM files? Edited April 4, 2021 by Shannon Quote Link to comment Share on other sites More sharing options...
RevEng Posted April 4, 2021 Share Posted April 4, 2021 I'm not familiar with that tool. I use my stand-alone program 7800header from the 7800AsmDevKit which can add/strip headers. Quote Link to comment Share on other sites More sharing options...
BydoEmpire Posted April 5, 2021 Share Posted April 5, 2021 Just out of curiosity, what are the graphical glitches? Quote Link to comment Share on other sites More sharing options...
RevEng Posted April 5, 2021 Share Posted April 5, 2021 3 hours ago, BydoEmpire said: Just out of curiosity, what are the graphical glitches? When sprites aren't perfectly aligned in a zone, the zone graphics are incorrectly aligned. Some lines appear as if they're missing, other lines appear to be duplicated. 1 Quote Link to comment Share on other sites More sharing options...
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