low voltage chip in snes cart

[lidnariq]

Say, for the moment, you had an 8megabyte 'PROM. There would be 23 address lines, 1 control line, and 8 data lines, so you'd need two of these level shifters.
Do something like this:
Chip 1:
1DIR-5V
1/OE-gnd
1B1…1B8-SNES A0…A7
1A1…1A8-'PROM A0…A7
2DIR-5V
2/OE-gnd
2B1…2B8-SNES A8…A15
2A1…2A8-'PROM A8…A15 (unless you need to skip A15 'cuz it's LoROM)
Chip 2:
1DIR-5V
1/OE-gnd
1B1…1B7-SNES A16…A22
1B8-SNES /OE
1A1…1A7-'PROM A16…A22
1A8-'PROM /OE
2DIR-gnd
2/OE-SNES /OE
2B1…2B8-SNES D0…D7
2A1…2A8-'PROM D0…D7

I just realized that I don't know if you have a single output enable from the SNES or MAD or 74'138, or if you need to combine /RD with /CART... If the last, you'll need to make one, using a 741G32 or a two-transistor OR gate or something.

[MottZilla]

You'd need two of those because the data lines and address lines need level shifting. And any other lines that need to connect to the chip like /CE or /OE.