I just got a "gift"
2 pirate 60 pins board, 1 original 60 pin board and a SNES' Gamegenie.
As expected, none worked as it should
At least, I could fix one of the boards, it is Top Gun.
But there's one that is Rockman 3, it boots, but the boss selection screen is like this:
After I choose a boss, the game begins the amimation music, the screen fills with the blue logos and it locks.
I reviewed the whole board with a multmeter, all seems fine.
It uses 2 PRG ROMs, 28 pins, demuxed with an 74LS139, it's also used to generate the CHR ROM's /CE, since it's 28 pins too.
I had put LEDs on the PRG ROM's /CE lines to try to debug.
Both stay on, all the time. Is it correct? I was specting them to be only one on at a time...
Maybe they are, but are switching too fast for the eye to see.
So, any suggestions of what I could try next?
Thanks in advance.
2 pirate 60 pins board, 1 original 60 pin board and a SNES' Gamegenie.
As expected, none worked as it should
At least, I could fix one of the boards, it is Top Gun.
But there's one that is Rockman 3, it boots, but the boss selection screen is like this:
Attachment:
After I choose a boss, the game begins the amimation music, the screen fills with the blue logos and it locks.
I reviewed the whole board with a multmeter, all seems fine.
It uses 2 PRG ROMs, 28 pins, demuxed with an 74LS139, it's also used to generate the CHR ROM's /CE, since it's 28 pins too.
I had put LEDs on the PRG ROM's /CE lines to try to debug.
Both stay on, all the time. Is it correct? I was specting them to be only one on at a time...
Maybe they are, but are switching too fast for the eye to see.
So, any suggestions of what I could try next?
Thanks in advance.