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Sony PlayStation 1 Motherboard – PU‑23 Revision (SCPH‑900x Series)
The PU‑23 motherboard is the final major board revision used in late‑model “fat” PlayStation 1 consoles. It appears predominantly in the SCPH‑9000, SCPH‑9001, SCPH‑9002, and SCPH‑9003 retail units. This revision represents Sony’s last cost‑reduced redesign before the transition to the PSone, featuring a significantly smaller PCB footprint and the removal of the rear Parallel I/O port.
The PU‑23 motherboard is the final major board revision used in late‑model “fat” PlayStation 1 consoles. It appears predominantly in the SCPH‑9000, SCPH‑9001, SCPH‑9002, and SCPH‑9003 retail units. This revision represents Sony’s last cost‑reduced redesign before the transition to the PSone, featuring a significantly smaller PCB footprint and the removal of the rear Parallel I/O port.
Key Technical Details
Board Model: PU‑23
Sony PCB Number: 1‑674‑987‑11 (visible on the upper right of this variant)
Console Family: SCPH‑9000 / 9001 / 9002 / 9003
Architecture Change: Removal of the Parallel I/O port
PCB Footprint: Reduced board size for lower manufacturing cost
Fuse Layout: Updated fuse positions and markings (CAUTION: replace as labelled)
Board Model: PU‑23
Sony PCB Number: 1‑674‑987‑11 (visible on the upper right of this variant)
Console Family: SCPH‑9000 / 9001 / 9002 / 9003
Architecture Change: Removal of the Parallel I/O port
PCB Footprint: Reduced board size for lower manufacturing cost
Fuse Layout: Updated fuse positions and markings (CAUTION: replace as labelled)
Design Milestones
The PU‑23 revision marks several important structural changes:
Parallel I/O port removed to simplify the rear panel
Smaller PCB layout compared to PU‑20 and PU‑18
Consolidated component placement to reduce production cost
Updated CD‑controller and GPU package for late‑revision stability
These changes make PU‑23 the most compact and final motherboard design before Sony moved to the PSone’s PM‑41 series.
Modding Notes
The PU‑23 revision is popular among modders, but with specific considerations:
✔ Works well with:
MM3 modchips
PsNee
Internal wire‑based modchip installs
QSB (Quick Solder Board) solutions designed for late PS1 models
MM3 modchips
PsNee
Internal wire‑based modchip installs
QSB (Quick Solder Board) solutions designed for late PS1 models
✘ Not natively compatible with:
PSIO (Parallel I/O ODE)
The PU‑23 lacks the Parallel I/O port entirely
PSIO requires extensive modification to function on this board
PSIO (Parallel I/O ODE)
The PU‑23 lacks the Parallel I/O port entirely
PSIO requires extensive modification to function on this board
Because of this, PU‑23 consoles are typically modded internally rather than via slot‑in hardware.
Compatibility Summary
✔ Found In:
SCPH‑9000
SCPH‑9001
SCPH‑9002
SCPH‑9003
SCPH‑9000
SCPH‑9001
SCPH‑9002
SCPH‑9003
✘ Not Found In:
SCPH‑750x (PU‑20)
SCPH‑550x / 5552 (PU‑18)
SCPH‑100x (PU‑8)
PSone (PM‑41 / PM‑41(2))
SCPH‑750x (PU‑20)
SCPH‑550x / 5552 (PU‑18)
SCPH‑100x (PU‑8)
PSone (PM‑41 / PM‑41(2))
Ideal For
PS1 restoration projects
Late‑revision modchip installs
SCPH‑900x rebuilds
Collectors seeking the final “fat” PS1 motherboard design
PS1 restoration projects
Late‑revision modchip installs
SCPH‑900x rebuilds
Collectors seeking the final “fat” PS1 motherboard design
About US
At InSpire Video Games, we've been serving the retro gaming community for many years, earning a reputation for quality, reliability, and excellent customer service.
We specialise in genuine Sony PlayStation games, consoles, accessories, and collectibles, while also offering carefully selected products from other popular gaming platforms. Every item is accurately described, securely packaged, and prepared for a smooth buying experience.
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