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Arcade Cabinets

PSX-Based Arcade Boards

  Namco System 11, System 12 (and System 10?)
  Capcom/Sony ZN-1, ZN-2
  Konami GV, Konami GQ
  Taito FX-1A, Taito FX-1B
  Atlus PSX, PS Arcade 95, Tecmo TPS

CPU

Same as in PSX. Except, one board is said to be having the CPU clocked at 48MHz, instead of 33MHz???

GPU

Same as in PSX. Except, most or all boards are said to have 2MB VRAM instead of 1MB. Unknown how the extra VRAM is accessed... maybe as Y=512..1023... (though the PSX VRAM transfer commands are limited to 9bit Ysiz values, but maybe Y coordinates can be 10bit wide).

ROM vs CDROM

Arcade games are stored on ROM (or FLASH) instead of using CDROM drives.

SPU

Most PSX-based arcade boards are having the PSX-SPU replaced by a different sound chip (with each arcade manufacturer using their own custom sound chip, often controlled by a separate sound CPU).

Controls

Arcade boards are typically having digital joysticks instead of joypads, with differently named buttons (instead of /,[],(),><), probably accessed via custom I/O ports (instead of serial transmission)? Plus additional coin inputs and DIP switches.

Note: There's no documentation for those arcade boards yet, however, it might be possible to extract that info from MAME source code.