I am trying to get a single 16Mbit game (2 x 27c801) mod to work. The donor is a LoROM as is the source and the donor has a 74LS139N. I looked at the datasheet and if I'm understanding it right I should be able to pull pin 1 low (desolder and connect to gnd) to enable mapping to the second 27c801 from pin 5?
Also I have quite a few MAD1 chipped donors that I was wondering if any pins can be rewired to allow multiple EPROMs to be accessed without the need for a 139 to be added in (since I only have two donors with them and don't want to steal one if I don't have to).
Thanks in advance for any help!
Also I have quite a few MAD1 chipped donors that I was wondering if any pins can be rewired to allow multiple EPROMs to be accessed without the need for a 139 to be added in (since I only have two donors with them and don't want to steal one if I don't have to).
Thanks in advance for any help!