[GUIDE] Make a Reprogrammable Genesis Cart

[Jazzmarazz]

alright so I got a good deal on many 27c322 eproms and want to only use those. the first board I found as my first test was an acclaim 670128 that can be changed into a 32Mb board. I switched the jumper to J1 but it's still not working. while searching online I found an image of this board being used for a 32Mb game from default and it seems like it has some kind of resistor instead of the pure metal jumper

20140531_005530_0863_pcb_front.jpg

I programmed the unpadded rom (as people have been saying its not needed) and it doesnt work. I desoldered the rom and read it and did a hex compare to the original rom and they were the same.

1. That is not a resistor, it is a jumper. You can tell becusse of the single black stripe. You're probably thinking "that's odd" but it was quite common to use since pick-and-place machines could grab them and place them.

2. Did you "byte-swap" the rom image before programming it?