so i wanted to make an UNROM dev game, but the game is 128k and the board has a 28 pin mask rom with no extra holes on the end for a 32 pin eprom. can i just bend up pins 1,2,31,32?
You *should* bend those pins. The 1 can be let floating, the 31 and 32 should be connected to VCC, and the pin 2 to A16. Be carefull, because closing the cart with pins bent up can be hard, especially with wire on them (because your wires should not be damaged).
sorry, im a newb, but what is VCC? Thanks!!
VCC is the positive power supply. May also be called VDD or simply +5V.
oh ok, i get it. ill give it a shot. thanks for the info
so should i bend up pins 22 and 28 so i can wire them to pins 2, 30 and 31? thanks
Sounds like you've got some wrong pin numbers, either that or I misunderstood. Follow the directions on here for UNROM:
http://nesdev.com/NES%20EPROM%20Conversions.txt
An alternative to bending those pins is to use a sharp knife to cut the trace leading to it on the PCB, and wire from pin to pin (it could be a little easier that way, especially if you're installing a socket).
i dont understand. it says to hook up pin 2 to hole 22, but if you dont bend up pin 22, then how do you do this? And i assume the GND is hole 2 (hooked up to pin 24). thanks
Memblers wrote:
Sounds like you've got some wrong pin numbers, either that or I misunderstood. Follow the directions on here for UNROM:
http://nesdev.com/NES%20EPROM%20Conversions.txtAn alternative to bending those pins is to use a sharp knife to cut the trace leading to it on the PCB, and wire from pin to pin (it could be a little easier that way, especially if you're installing a socket).
You have to found another solver point where the track that was leading to pin 22 is before the point where you cut it with a knife.
A solver pad will be fair, else you'll have to scratch the PCB to have the copper available, then solver your wire directly on the copper.