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A question, which may have already been asked but I'm not finding it. To build a diagnostics game cart, what hardware is needed and from where can it be sourced? Looking to diagnose a YM2610 issue.
You just need a CHAR PCB with the programmed M1. You will need the S1 to display text so just leave all the chips on, just remove the stock M1 and replace with the programmed one.
So I basically would need to use a game cart? That's what I figured, just not sure I have one I want to scrap for it. Perhaps I'll keep an eye out for a cheap cart on ebay. On the AES side, is there a list of games with the correct sized M1/S1? Some of them look different...
Edit: Found a baseball stars for cheap, which looks like it has the expected M1 chip. Is the m1.bin also just burned to a 27c1024?
Or you can do what I did - get a EPROM twice the size and put both M1 images onto it (original game in lower half, M1 diag in the upper half) and have a jumper to switch the upper address line between high and low.
It boots and goes but you will need a game cart inserted so it can write text on the screen.
I have burned V 0.19 to diagnose a dead AES who shows green screen even if a game is inserted. But unlucky, Neo Diagnostics BIOS does not show up, I only have a screen with a random color and some "jail bars". When I press ABCD and reset I have a blue block a the top of screen. Image is flickering when a move the joystick but that's all.
How can I diagnose this AES console ? I allready test all color RAM lines and this BIOS does not works. Any idea ? Thanks
Start with the basic system which is CPU-BIOS-RAM. Make sure everything is connected then try again.
I got a very similar socketed bootleg of Neo Geo Cup that I used to test the P rom when I was making my Ironclad repro.