tepples wrote:If N64 games' save EEPROM indeed uses JOYBUS, it's either 1-Wire (good) or a custom part (unfortunate).
JOYBUS is a proprietary protocol, not 1-wire. Unlike 1-wire, the falling edge is sent by whatever's talking, not the host. And it's faster.
Fisher wrote:AFAIK the EEPROM part number is BU9850.
There are four serial EEPROMs used in the N64:
BU9850, BK4K - both 4kibit
BK16DH, BK16DF - both 16kibit
The two on the left behave the same subtly different way from the two on the right. Normal games don't care. I'm told that at least one ROM hack has used the difference as a kind of DRM.
I've found a package with 10 for sale on [Aliexpress.]
Those are used part pulls, if you care.