The Z64 “Mr. Backup” is one of the rarest Nintendo 64 accessories still in the wild — a backup unit that was discontinued and pulled from the market under legal pressure, making working units increasingly scarce. This is Part 1 of a three-part repair and preservation series.
Background: What the Z64 Is
The Z64 was manufactured by BUNG Enterprises in the late 1990s. It connected to the N64’s cartridge slot and allowed you to dump ROM images from cartridges to ZIP disks, then load them back. Nintendo pursued legal action, BUNG was forced to stop production, and the units that existed are all there will ever be.
That makes every working Z64 a piece of console history. This one needs work — specifically, the flash BIOS chip is dead. The chip in question is a DIP32 SST 28SF040 150-4C-PH. The replacement target is a compatible 150-4C-NH in a PLCC32 package — same memory array, different form factor, requires an adapter.
Part 1: Diagnosis and Chip Research
This episode covers how the unit was acquired, what’s wrong with it, and the initial investigation into viable replacement chips. The goal isn’t just getting this unit running — it’s understanding the failure mode well enough to document a repeatable repair path for anyone else who ends up with a dead Z64.
If you have experience with SST 28SF040 replacements or PLCC32 adapters for DIP32 sockets, Rob is actively looking for guidance from the community.
Series Status
- Part 1 — Diagnosis and chip investigation (this video)
- Part 2 — Coming soon
- Part 3 — Coming soon
Rob streams live repairs and builds every Tuesday and Saturday at 7pm Eastern on Twitch. The Bonus Life N64 build — a complete custom Nintendo 64 being rebuilt from scratch and given away July 3rd, 2026 — is the current main series.