System self-test: Difference between revisions
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AES and MVS BIOSes compute their own checksums and compare them against the 16bit value at address $000080. The checksum is a simple byte sum of the whole ROM except locations $000080 and $000081. | AES and MVS [[BIOSes]] compute their own checksums and compare them against the 16bit value at address $000080. The checksum is a simple byte sum of the whole ROM except locations $000080 and $000081. | ||
= AES = | =AES (all versions ?)= | ||
Screen color meanings (information by Channelmaniac): | Screen color meanings (information by Channelmaniac): | ||
*Blue: All tests passed (The AES does not test the Z80 sound IC). | *Blue: All tests passed (The AES does not test the Z80 sound IC). | ||
*Red: [[68k RAM|Work RAM]] error ($100000 region). | *Red: [[68k user RAM|Work RAM]] error ($100000 region). | ||
*Green: [[Palette RAM]] error ($400000 region). | *Green: [[Palette RAM]] error ($400000 region). | ||
*Yellow: [[VRAM|Video RAM error]] (programmed through custom port). | *Yellow: [[VRAM|Video RAM error]] (programmed through custom port). | ||
*Pink: BIOS | *Pink: BIOS checksum error (0xC00000 region). | ||
*Cyan: Memory card error (only tested if card in unit and blank). | *Cyan: Memory card error (only tested if card in unit and blank). | ||
= MVS (SP-E VERSION 0) = | =MVS (SP-E VERSION 0)= | ||
[[File:error_cram.jpg|thumb]] | [[File:error_cram.jpg|thumb]] | ||
| Line 18: | Line 18: | ||
[[File:error_z80.jpg|thumb]] | [[File:error_z80.jpg|thumb]] | ||
Information by Channelmaniac: | |||
When a MVS board is powered up without a cartridge installed, the border color around the edges of the crosshatch screen indicates the BIOS region: | |||
Green: 6 slot, an older BIOS | *Green: 6 slot, an older BIOS | ||
Light | *Light blue: USA BIOS, labelled SPU2 | ||
Dark | *Dark blue: Spanish BIOS, labelled SPS2 | ||
Red: Japanese BIOS, | *Red: Japanese BIOS, labelled SPJ2 | ||
Check order ? | Check order ? | ||
Revision as of 02:49, 7 March 2011
AES and MVS BIOSes compute their own checksums and compare them against the 16bit value at address $000080. The checksum is a simple byte sum of the whole ROM except locations $000080 and $000081.
AES (all versions ?)
Screen color meanings (information by Channelmaniac):
- Blue: All tests passed (The AES does not test the Z80 sound IC).
- Red: Work RAM error ($100000 region).
- Green: Palette RAM error ($400000 region).
- Yellow: Video RAM error (programmed through custom port).
- Pink: BIOS checksum error (0xC00000 region).
- Cyan: Memory card error (only tested if card in unit and blank).
MVS (SP-E VERSION 0)
Information by Channelmaniac:
When a MVS board is powered up without a cartridge installed, the border color around the edges of the crosshatch screen indicates the BIOS region:
- Green: 6 slot, an older BIOS
- Light blue: USA BIOS, labelled SPU2
- Dark blue: Spanish BIOS, labelled SPS2
- Red: Japanese BIOS, labelled SPJ2
Check order ?
Possible errors:
- WORK RAM ERROR (68k RAM)
- BACKUP RAM ERROR (Battery-backed RAM)
- COLOR RAM BANK0 ERROR (First bank of 256 palettes)
- COLOR RAM BANK1 ERROR (Second bank of 256 palettes)
- VIDEO RAM ERROR (VRAM)
- CALENDAR ERROR
- SYSTEM ROM ERROR (BIOS ROM checksum fail)
- MEMORY CARD ERROR
- Z80 ERROR (no reply to sound command $01)