I'm trying to make a starfox 2 game with 2 x 49f040 and the donor is stunt race. I know about the 74ls139 method, but the problem is that the /CE and /OE pins on the mask rom are in fact GND. Any sugestion? I also made the gsu-1 pinout (as in stunt race): 01-GND 02-rom A18 03-rom A17 04-rom A16 05-rom A15 06-rom A14 07-rom A13 08-rom A12 09-rom A11 10-rom A10 11-rom A9 12-rom A8 13-rom A7 14-rom A6 15-rom A5 16-rom A4 17-rom A3 18-rom A2 19-rom A1 20-rom A0 21-rom D7 22-rom D6 23-rom D5 24-rom D4 25-rom D3 26-rom D2 27-GND 28-rom D1 29-rom D0 30-VCC 31-NC 32-snes 54 33-snes 23 34-snes 26 35-snes 53 36-snes 52 37-snes 51 38-snes 50 39-snes 22 40-GND 41-VCC 42-snes 21 43-snes 20 44-snes 19 45-snes 47 46-snes 46 47-snes 45 48-snes 44 49-snes 43 50-snes 42 51-snes 41 52-snes 40 53-snes 39 54-snes 38 55-snes 37 56-snes 18 57-snes 17 58-snes 16 59-snes 15 60-snes 14 61-snes 13 62-snes 12 63-snes 11 64-snes 10 65-snes 9 66-snes 8 67-snes 7 68-snes 6 69-GND 70----------------hcu04 71-sram D0 72-sram D1 73-sram D2 74-sram D3 75-sram D4 76-sram D5 77-sram D6 78-sram D7 79-sram A0 80-sram A1 81-sram A2 82-sram A3 83-sram A4 84-sram A5 85-sram A6 86-sram A7 87-sram A8 88-sram A9 89-VCC 90-GND 91-sram A10 92-sram A11 93-sram A12 94-sram A13 95-sram A14 96-GND 97-sram A15 98-sram OE 99-sram WE 100-rom A19
