Excellent page about the graphic glitches, will definitely take some time to get the pinout of lspc-a/pro chips next month. How did you emulate the glitches, is MAME low level enough to "cut the traces" in the code ? --Furrtek 09:02, 17 June 2012 (CEST)
Thanks, any extra info you have would be great. I didn't modify MAME. It's just some tiny C apps that read in the unmodified ROMs and output files with the glitches simulated and ran MAME with those. --SMKDAN 08:30, 18 June 2012 (CEST)
Okay, I see. Do you think it's possible to simulate other cuts such as on DOTA/DOTB... and on those in between lspc/B1 without too much effort ? I'll trace out the old chips pinouts from a dead board asap.--Furrtek 11:07, 18 June 2012 (CEST)
I'd like to do something like that but I need low level info on how those work. I read DOTA/DOTB is output by ZMC2 or whatever when pixel is opaque and goes to LSPC2, so NEO-B1 does not automatically drop transparent pixels and requires LSPC to command it to draw every individual pixel? With xpos sent to it on P-bus etc.? That's my best guess for now. All the other LSPC<->B1 signals have really cryptic names but I have guesses as to what they are, but no easy way to confirm it. If the right info was posted I'd modify MAME's driver to create some realistic pics later on.