N64 rom adapter

A place that you can discuss reproduction of classic titles or "licensed-for-reproduction" homebrew for personal use.

Moderators: B00daW, Moderators

Forum rules
1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
Post Reply
Frankym2612
Posts: 36
Joined: Thu Jun 27, 2019 8:25 pm

N64 rom adapter

Post by Frankym2612 »

Hi all I have made various rom adapters for Nes Snes master system genesis and now I want to try N64 but from what I read it’s not so straightforward and I admit I don’t know how the N64 roms work and can’t find any info online is it possible and can I get some help?
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: N64 rom adapter

Post by lidnariq »

N64 has a multiplexed address and data bus, so you need extra hardware to convert that into something that could be used with a conventional NOR flash ROM.

To wit:
With ALE_H high, everything is disabled
On a falling edge of ALE_H, AD0-AD15 should be latched and become A16-A31
On a falling edge of ALE_L, AD0-AD15 should be latched and become A0-A15
On a rising edge of /RD or /WR, the address should be incremented to the next 16-bit word; for at least 256 words. (This is configurable by the ROM header, but no less than 2 words and no more than 65536)

Carts that have any save memory at all require even more hardware.
Frankym2612
Posts: 36
Joined: Thu Jun 27, 2019 8:25 pm

Re: N64 rom adapter

Post by Frankym2612 »

Thank you!
Post Reply