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arcade-docs/andamiro/board/mkv.md
voidderef 0e382dfc13 andamiro: Add more MK5/V documentation 
* Update general information about the mainboard taken
  from an actual MKV I own
* Add information about the hex codes showing on the 7
  segment display next to the mainboard breakout
2024-06-20 21:34:52 +02:00

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MKV

AKA MK5

  • OS
  • PIUIO connected to the ISA bus
  • CPU
    • Intel Celeron 1 GHZ
    • Intel Celeron 1.3 GHZ
  • RAM: 128 MB
  • GPU (on-board)
    • Riva TNT 2, 32 MB
  • Chipset
    • Nvidia NV11
    • VIA Apollo Pro133 AX (VT82C694X + VIA686B)
  • BIOS
    • PhoenixBIOS 4.0 Release 6.0
  • Disk media
  • 7 segment display on the side shows current boot status/error codes
  • EEPROM to store game settings and high scores. Size increased (doubled?) comapred to MK3

7 segment status and error codes

This display next to the mainboard breakout connectors shows an 8-bit hex value indicating different stages of the boot process and errors.

Errors are usually "stuck values". A healthy boot sequence has these numbers changing to show it progresses through the different stages

Healthy boot sequence

The following is "transcribed" from a video recording of a healthy boot sequence (from power on to game title screen). All values are 8-bit hex values.

  • FF: Initial state shown right after power on
  • 81: ???
  • 84: ???
  • 85: ???
  • 86: ???
  • 87: ???
  • 88: ???
  • 08: ???
  • 11: ???
  • 0C: ???
  • 28: ???
  • 2E: ???
  • 38: ???
  • 09: ???
  • 69: ???
  • 49: ???
  • 4A: ???
  • 59: ???
  • 52: ???
  • 60: Video output over VGA shows the Andamiro logo on white background, first actual video output visible
  • 98: ???
  • 6A: ???
  • 00: ???
  • 01: ???
  • C0: ???
  • D2: ???
  • 00-99/00: Progress counting upwards from 0 (00) to 100 (00)
  • FF: ???
  • 88: ???
  • FF: ???
  • 88: ???
  • A2: booted from HDD, starting with andamiro MKV bootloader stage and stays also when in-game

Operating system/game booted

Once the display shows A2, it's also flickering.

The bottom segment of the first digit as well as the top left and bottom right segments of the second digit are used as HDD, CPU and ??? indicators.

Other codes

  • 01: In BIOS menu

Errors

Stuck at FF right after power on

If the BIOS isn't loading, then it is stuck right after power on.

This might indicate that something is wrong with the power to the mainboard. Ensure you are using the power distribution board of the MKV box and not have a ATX power supply connected directly to the mainboard. It powers, but doesn't seem to like that and stays stuck here immediately.

Stuck at C0

Operating system not found.

This should also be visible on over VGA output with a message stating this on a connected screen.

Stuck on B0

CMOS checksum bad.

This should also be visible on over VGA output with a message stating this on a connected screen.

Probably the CMOS battery is empty, swap it, power cycle. Defaults are being loaded automatically.

Misc

  • USB keyboards work, e.g. to get into the BIOS by pressing F2 during boot