Megadrive/Genesis

Jag lär mig fortfarande en del om detta så se denna tråd som en work in progress.

En guide som var rätt bra: http://www.epforums.org/showthread.php?63960-GUIDE-Make-a-Reprogrammable-Genesis-Cart

Vad jag fått fram är att sin donor cart ska ha precis samma storlek som repron man vill bygga.

Headers, byte swap etc:

Genesis ROMs don\'t have headers that you have to remove like SNES or NES ROMs do. The only thing you have to do is a \'swap byte\' before you burn (this function should be in your programmer\'s software).

The final step is to solder your chip onto your empty board. If your board supports your chip size, solder it directly to the board without worrying about rewiring any pins. Make sure the notch on your EPROM points left, as shown in the photos. If you used a socket, place it in that. I like to test the chip before soldering in a socketed board.
If you chose a smaller donor board and need to rewire a few pins, move to step 7b, otherwise you are finished and can move on to step 8.

The size of your eprom and donor board define the wiring schematic.

A18 must be wired to pin B7.
A19 must be wired to pin B8.
A20 must be wired to pin B9, unless is is a saving game in which case it must go to pin 5 of the 74H00 IC.

Detta stod även i samband med denna bild:

Madden 97 is a 2MByte ROM. According to the chart above, you must connect A20 to the cart\'s edge, otherwise it will be floating or pulled high or pulled low depending. Check to see if A20 on the ROM is connected to anything on the board. If it connected to something, pull the pin up or cut the trace; then reroute it to A20 on the cart\'s edge.
No padding is necessary.

Är cart\'s edge i detta fall pinnarna som går ner till connectorn?

Söker febrilt efter bra guider ang detta. Och någon typ av lista på storlek på spel + vilken typ av ram de använder.

EDIT: Eller är cart\'s edge hålen för epromet på kretskortet?
Jag klistrar in massor av text här tills jag har mer kött på benen att skriva ihop en egen guide för detta 🙂