Sega Genesis Cart PCB & 27C160 Compatibility

[TmEE]

You have a 2x 8bit chip setup ?

[MottZilla]

No, I'm using a single 16bit eprom on a PCB that accepts it. I don't have any PCBs that use two 8bit roms.

[Michael]

Some people turn two 8 bit eproms into a 16 bit eprom for sega repros. Not the way to go if you can help it, but it works...

[l_oliveira]

There is no mystery on that, you take the two eproms, wire them so the address lines are connected in parallel ... Each of the eproms have it's outputs connected to one of the bytes of the 68000 bus... /CE and /OE go normally to the same pins they would for a 16 bit rom and are tied together just like the address lines.

[TmEE]

my flashcart is using 2x 8bit 16Mbit flashchips... all chip operations are in parallel, though you can program chips separately, though it is useless and slow in most cases :P

[Michael]

There is no mystery on that, you take the two eproms, wire them so the address lines are connected in parallel ... Each of the eproms have it's outputs connected to one of the bytes of the 68000 bus... /CE and /OE go normally to the same pins they would for a 16 bit rom and are tied together just like the address lines.

No mystery, just a lot more work.

[l_oliveira]

When you burn something on the chip and then dump it with the same device, things would look same as original....

Trust me ... That is not aways true .... :oh:

[MottZilla]

Well I got the connectors I needed and I'll built the adapter for the 9pin serial cable tonight and try dumping the eprom that way.

Edit: Well I built this cable and it doesn't seem to transfer for shit. All the bytes were 44s when dumping. I can't get this send test to work either. I don't have a clue what the problem is here.

Edit: Since I couldn't get that transfer cable to do anything I am going to go ahead and just get the same image which has been byte swapped programmed onto another chip and just hope that it works. I wouldn't be surprised if my attempt as byteswapping with wires was somehow faulty. Could have had a short somewhere or a bad connection, plus the wire I used was just cat5e wires I had around.

[MottZilla]

Problem solved. It was a byteswapping issue. I'm guessing something was wrong with my attempt at manually byteswapping with the wires. But byteswapping before programming solved the issue.

[NTM]

Sorry to bump an old thread, but I am working on burning Langrisser II translation back on an original MD Langrisser II pcb. I am also using a 27c160, but not having any luck. Tired burning with bytes swapped and still a no go.

EDIT: Nevermind. Got it working.

[MottZilla]

Since you bumped care to add what your mistake was so others can check if they made the same fault?

[NTM]

Since you bumped care to add what your mistake was so others can check if they made the same fault?

Yeah sorry. Just re-re-burned it. Think my programmer wasnt making a good connection to the eprom. It would say it was programmed correctly, but just wouldn't boot when put in the cart.

After jacking with my programmer a bit, it finally worked. Not sure why it was acting screwy.. Byteswapped and a 27c160 on the same board pcb you used worked perfectly.

[APE]

Going to bump this one as I'm about to try this myself. I cannot verify for the life of me the lack of need to strip the header before burning. Does one need to do so?

Answer: No, there is no header to rip. Works fine just simply byteswapped.