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Making SEGA Genesis cartridges
pbj:
What rom are you trying to run? If it’s 512Kb, you bend up eprom pins 1 and 42 and jump them to 5V. If it’s 1MB or 2MB, follow my pic from the first page of this thread showing which pins on the edge connector need what. Tell me the game and I’ll play along.
:cheers:
bulldawg:
Golden axe 2 on a 2mb 42 pin eprom. Donor pcb is RBI 93 42 pin 512kb pcb. So even if its 42 pin pcb still bend first 2 legs?
pbj:
No… no…. Only bend the legs if the PCB is 40 pin.
I’m almost positive I have one of those RBI boards laying around. I’ll convert to Golden Axe 2 and take pictures.
pbj:
Are you using M27C400 or M274002? 4002 has the wrong pin out.
Okay, assuming that you're using M27C400 and your PCB is the same as pictured here:
(found on this page: https://www.pricecharting.com/game/sega-genesis/rbi-baseball-93 )
Pin 1 on the ROM is running to B7. Pin 42 is being pulled high to 5V. Your simplest fix is going to be cutting the trace on the back of the board for pin 42, and running a jumper wire from pin 42 to B8 on the edge connector. That will tell the Genesis it's a 2MB EPROM.
bulldawg:
--- Quote from: pbj on June 12, 2023, 09:08:10 am ---Are you using M27C400 or M274002? 4002 has the wrong pin out.
Okay, assuming that you're using M27C400 and your PCB is the same as pictured here:
(found on this page: https://www.pricecharting.com/game/sega-genesis/rbi-baseball-93 )
Pin 1 on the ROM is running to B7. Pin 42 is being pulled high to 5V. Your simplest fix is going to be cutting the trace on the back of the board for pin 42, and running a jumper wire from pin 42 to B8 on the edge connector. That will tell the Genesis it's a 2MB EPROM.
--- End quote ---
Im using m27c160 on this one. I should have mentioned this is different from the other one I was working on. But that would make sense why the other board is not working being 4002 is different pinout.
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