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?
- Thread starter ekorz
- Start date
J
jassin000
(Actually from the Genesis version, but still appropriate)
ah, you're right. I was thinking they were OTP for some reason.
I got everything burned and installed. set the jumpers, installed a normal MC6800P10, and used the decrypted 317-0158 ROMs from jammarcade.net
the game boots but there's no sound, it will coin up and I can start a game but a few seconds after starting my character freezes and. it's not a total lock up because some enemy animations continue. but that's as far as it goes.
i confirmed everything (audio included) was working before I did the conversion. It will go into test mode and it verifies everything as good.
I pulled the ROMs an IC4 and verified them all as good and double checked the jumpers... Not quite sure where to go from here.
the game boots but there's no sound, it will coin up and I can start a game but a few seconds after starting my character freezes and. it's not a total lock up because some enemy animations continue. but that's as far as it goes.
i confirmed everything (audio included) was working before I did the conversion. It will go into test mode and it verifies everything as good.
I pulled the ROMs an IC4 and verified them all as good and double checked the jumpers... Not quite sure where to go from here.
Yeah, I bought a few 27c1000 just for this.
It's an ST M27C1000-15F1
it doesn't appear to use the JEDEC pinout according to the datasheet: http://www.datasheets360.com/pdf/-8867648234888791451
I don't know what the non-JEDEC pinout should look like but this chip has A16 on pin 24 instead of pin 2
@ekorz which patched ROMs did you use?
Are you sure? the Max Loader software for my ChipMax2 only lists 1 chip from ST with that part number in a DIP32 package.
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.
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.
Since these are older chips, you have to be very careful when lifting them or the legs may snap off.
Here's what you want, these are equivalent to non JDEC 27C1000 and what I used for a system 16 PCB: https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/271257176513
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.
A
Apocalypse
Old
I built myself an adapter as I have to burn those chips quite often.
Mine were from Jammarcade I thi--
You're too fast again...
is MC6800P10 the chip I need to replace the Hitachi FD1094? Now is the MC6800P10 10mhz or 12mhz? Just need to know as hyperneogeo is supplying me with all the chips.
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 bloxeed
