So I finally got my AT89c51 in... does this just get flashed with the file in MAME or is there something else I should be using?
ah, you're right. I was thinking they were OTP for some reason.plus it's erasable iirc
It's an ST M27C1000-15F1Did you confirm the pinout of the 27c1000 you ordered?
Are you sure? the Max Loader software for my ChipMax2 only lists 1 chip from ST with that part number in a DIP32 package.iirc there were both jedec and non jedec versions of that chip from ST.
271000s are honestly the most PITA chip I've had to deal with. I had to buy multiple types to get one that was actually non JEDEC (these will be older chips). Technically the JEDEC ones should be called 27C1001 instead, but that's unfortunately not the case in practice.Are you sure? the Max Loader software for my ChipMax2 only lists 1 chip from ST with that part number in a DIP32 package.iirc there were both jedec and non jedec versions of that chip from ST.
OldI had to buy multiple types to get one that was actually non JEDEC (these will be older chips). Technically the JEDEC ones should be called 27C1001 instead, but that's unfortunately not the case in practice.
I built myself an adapter as I have to burn those chips quite often.The shittiest part of the problem I ran into was the Top3000 will only write 27C1000s in JEDEC. So if you have a JEDEC 27C1000 chip it will program and verify OK, but not work correctly on the PCB.
If you have a non JEDEC chip, then it will write "OK" then fail on verifying (because GND and A16 were swapped).
What I had to do was find actual non-JEDEC chips, swap pin 2 and 24 manually (by lifting them, doing a mod to the Top3000 and using dupont wires to connect to the lifted pins) and program them as (JEDEC) 27C1000.
Mine were from Jammarcade I thi--@ekorz which patched ROMs did you use?
You're too fast again...I got it working... the st chips I bought are indeed non-jedec. I went to pull the chip to try your leg swap idea and one of the legs broke off and stayed in the socket. I burned a new chip after verifying that all the legs were good and now the game is working great.
ok ty for info he has a 12mhz one says it won't make a difference. So I should be all set just need to ship my bloxeedIt’s a Motorola 68000 processor. 10mhz. MC68000P10. Yes it replaces a fd1094