problem with replacing the mv1c's bios

k ... desoldering the bios and soldering the 40 wires to the pcb was easier than i thought it would be. everything looked clean and all, so i went on an soldered the other end of the wires to the socket that i wanted to put the 27c1024 in.
when i powerd it up, all i got was a mess of colorful blocks on the screen.

i tried 2 different eproms with the uni bios 2.1 and also a legit european bios, but none of them worked.

already thought, i would have ruined the board and decided to solder up the 1c's bios again to see, if that one still worked. it does. in fact, i just played a few rounds of kof96.

so ... is there a trick or something? different pinout?

here's a few pics :







and yes, it's working :

The 1C uses a different pinout rom. You will need something along the lines of a 27C400 eprom, or wire up your socket differently to match the pinout of a 27C1024. I gave this info to Raz and I think it's on his site. If not, let me know and I will send you some PDFs so that you can see what you'll need to do.

Jeff

thanks for the hint, Jeff. i even read the info on Raz' site before, but totally forgot about it.
i downloaded the txt and will try to get it to work, tomorrow.

Please let us know how it goes once you rewired it all.

Raz

Razoola said:

Please let us know how it goes once you rewired it all.

Raz

Click to expand...

just re-wired it using the pinout that you have on your site. it works. thanks.

Good Stuff

Raz

another pic of the finished mod :



just played 4 rounds of magical drop 3. loving it.