System self-test

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Todo: Order of checks.

Cartridge systems

Information by Channelmaniac.

Error No game WORK RAM ERROR COLOR RAM ERROR VIDEO RAM ERROR SYSTEM ROM ERROR MEMORY CARD ERROR
AES Aes sc blue.png Aes sc red.png Aes sc green.png Aes sc yellow.png Aes sc pink.png Aes sc cyan.png
MVS Crosshatch.png Crosshatch Error wram.png Error color0.png Error vram.png Error sysrom.png Screenshot needed
Meaning All tests passed (AES does not test the Chipicon.png Z80). Cartridge not detected. 68k user RAM R/W error Palette RAM R/W error VRAM R/W error System ROM checksum mismatch Memory card R/W error (only tested if card present and blank)

MVS checks

Additionnal checks are performed on MVS systems:

Error BACKUP RAM ERROR Calendar freeze CALENDAR ERROR Z80 ERROR
Display Error bram.png Calendar freeze.png Error calendar.png Error z80.png
Meaning Backup RAM R/W error RTC isn't giving Time Pulse RTC ran to slow or too fast Z80 didn't reply to command

When a MVS board is powered up without cartridges inserted, the border color around the edges of the crosshatch screen indicates the system ROM region:

  • Red: Japanese, SPJ2
  • Cyan: USA, SPU2
  • Blue: Korean/Spanish, SPS2
  • Yellow: European
  • Green: 6 slot (ROM name ?)

UniBios tests

The Universe BIOS does not use the above color codes to indicate errors.