MM3 / OneChip / Mayumi
MM3 / OneChip / Mayumi Modchips
MM3, OneChip, and Mayumi are older commercial modchips from the original PlayStation's heyday. They predate today's open-source designs and were sold as ready-made boards to enable imports, homebrew, and playable backups for preservation. You'll still encounter them in second-hand consoles and on the used market, so it helps to know what they are.
What they are
These are dedicated modchip boards that wire into the mainboard much like modern chips. Each was its own product line with its own revisions, but functionally they all sit alongside the original optical drive and let the console accept a wider range of discs.
How they compare today
Because they are commercial and largely discontinued, supply is inconsistent and documentation can be scattered or dated. For a brand-new install, the open-source PSNee is usually the more practical and better-supported choice. The older chips remain relevant mainly when you've bought a console that already has one fitted.
| Aspect | MM3 / OneChip / Mayumi |
|---|---|
| Type | Older commercial modchips |
| Availability | Mostly used / discontinued |
| Soldering | Required |
| Media | CD-R discs |
Already have one fitted?
If a console you own already contains an MM3, OneChip, or Mayumi, there's often no reason to replace it. Identify the chip, confirm it works, and keep it. For a fresh project, lean toward a modern open-source chip or an ODE instead.
Pros: simple ready-made boards, fine if pre-installed. Cons: dated, harder to source, less documentation than current options.