Repro snes Cartridge

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Luckaosts
Posts: 3
Joined: Mon Nov 02, 2020 8:02 am

Repro snes Cartridge

Post by Luckaosts » Mon Nov 02, 2020 8:09 am

hello, i'm new to the group and i'm having difficulties to elaborate my rescheduled snes projects, i'm currently using memory 29l3211, but i can't find any pcb project to make the games, could someone help me?

lidnariq
Posts: 10241
Joined: Sun Apr 13, 2008 11:12 am
Location: Seattle

Re: Repro snes Cartridge

Post by lidnariq » Mon Nov 02, 2020 10:56 am

Don't use a low-voltage part like that one (29L) without adding voltage translation.

1- the SNES won't reliably receive 3.3V as logic high
2- attaching a 3.3V part without voltage translation will damage the 5V SNES and the ROM.

For down-translation, from the address and control lines to the ROM, you can use almost anything - voltage dividers, voltage clamps like the GTL2000, active translation like the 7416245. For up-translation, from the ROM's data bus to the SNES, you need some active translation.

Luckaosts
Posts: 3
Joined: Mon Nov 02, 2020 8:02 am

Re: Repro snes Cartridge

Post by Luckaosts » Mon Nov 02, 2020 1:17 pm

i have used an original pcb adapter, it has a 3.3v voltage regulator and a 104 capacitor, i wanted to find a pcb project that could do both lo-rom and hi-rom in the same way

lidnariq
Posts: 10241
Joined: Sun Apr 13, 2008 11:12 am
Location: Seattle

Re: Repro snes Cartridge

Post by lidnariq » Mon Nov 02, 2020 1:52 pm

Yeah, don't use those without extra parts for voltage translation. They're bad for the ROM on the adapter board and bad for the SNES.

Luckaosts
Posts: 3
Joined: Mon Nov 02, 2020 8:02 am

Re: Repro snes Cartridge

Post by Luckaosts » Tue Nov 03, 2020 5:45 am

so i'm brazilian and i don't have much knowledge of making a snes pcb project from scratch, i would like to know if anyone has a project that they want to share

lidnariq
Posts: 10241
Joined: Sun Apr 13, 2008 11:12 am
Location: Seattle

Re: Repro snes Cartridge

Post by lidnariq » Tue Nov 03, 2020 10:57 am

Here's another user's verbose writeup: https://thepoorstudenthobbyist.com/2017 ... cartridge/

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