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This is a conversion/edition of Martin "nocash" Korth's Playstation specs document originally hosted at https://problemkaputt.de/psx-spx.htm. See https://github.com/psx-spx/psx-spx.github.io#readme for more details.
You can also download this website as a single-page pdf.

To discuss the contents of this document, or hang out with likely minded people on development, hacking, and reverse engineering of Sony's first console, feel free to join the PSXDev Network Discord Server.

Memory Map
I/O Map
Graphics Processing Unit (GPU)
Geometry Transformation Engine (GTE)
Macroblock Decoder (MDEC)
Sound Processing Unit (SPU)
Interrupts
DMA Channels
Timers
CDROM Drive
Controllers and Memory Cards
Pocketstation
Serial Port (SIO)
Expansion Port (PIO)
Memory Control
Unpredictable Things
CPU Specifications
Kernel (BIOS)
Arcade Cabinets
Cheat Devices
PSX Dev-Board Chipsets
Hardware Numbers
Pinouts
About & Credits
CDROM Video CDs (VCD)
CDROM Internal Info on PSX CDROM Controller