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intric8
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Amiga Boot-up Screen Colors and System Error Checklist

by intric8 Fri Sep 08, 2017 9:18 pm

When you boot up your Amiga you are always greeted with a series of flashing screen colors. On most days the screen will change from dark gray to a couple lighter shades then white before marching on. On bad days, it flicks over to an actual color of the rainbow, each with its own heart-stopping meaning.

What do those colors mean? And what is the Amiga doing during the boot-up process in the first place?

The following is a collection of ancient and excellent information compiled from various sources.

During boot-up, the Amiga is going through a series of system checks and routines.
  1. Clear all chips of old data
  2. Disable DMA and interrupts during the test.
  3. Clear the screen.
  4. Check the hardware ....checks to see if 68000 is functioning.
  5. Change screen color.
  6. Do a checksum test on all ROMS.
  7. Change screen color.
  8. Beginning of system startup.
  9. Check RAM at $C0000 and move SYSBASE there
  10. Test All CHIP RAM.
  11. Change screen color.
  12. Check that software is coming in ok.
  13. Change screen color.
  14. Setup CHIP RAM to receive data.
  15. Link the libraries
  16. Check for additional memory and link it
  17. Turn the DMA and interrupts back on.
  18. Start a default task.
  19. Check for 68010, 68020, 68881 or other processor upgrades.
  20. Check to see if there is an exception or processor error
  21. If so do a system reset. 

During this system test the Amiga is sending vital information to the
screen with colors. If the system checks out ok, you will see the following
sequence that you have seen so many times.
 
DARK GRAY:  The initial hardware tested OK. the 68000 is running and the registers are readable.
LIGHT GRAY: The software is coming in and seems OK.
WHITE: The initialization test have passed.

The failure mode screen colors:
  • Turquoise (0x0CC) (A1000 only): RAM failure in the Kickstart WCS
  • Green (0x0F0) error in the lowest 256 bytes of Chip RAM. Possible causes, defective CIA-A IC or defective Agnus IC.
  • Yellow (0xFE5) an unexpected processor exception before the appropriate system failure message was prepared. This could mean defective hardware or an attempt to access a RAM address where no RAM exists.
  • Red (0xF00) invalid KickStart ROM checksum.
  • Magenta (0xF0F) single-task or cold-start initialization failed.
Another listing of screen color interpretations:

REDKickstart ROM errorTwo ICs in A1200, A3000, A4000
BLUECustom chip problemDenise Paula Agnus
GREENRAM error
YELLOWAbove problems combined
LIGHT GREENCIA (U7/U300) problem
BLACKCIA (U7/U300) problemIf not booting
DARK GRAYHardware tested OK
LIGHT GRAYSoftware tested OK
LIGHT GRAYCIA (U8/U301) problemStops at gray, CIA defective
BLACK/STRIPESROM or CIA
No videoR406 or R215 open R406=1 ohm R215=4.7 ohm
Video scrambledAgnus or Denise defective

If the Amiga caps lock key LED blinks repeatedly at boot up, another series of error messages must be consulted:
  • One blink: keyboard ROM checksum error
  • Two blinks: RAM failure
  • Three blinks: watchdog timer failure
If something is wrong with your system, you may see the following:
  • RED: Error was found in ROMS.
  • GREEN: Error found in the CHIP RAM.
  • BLUE: Error was found in the custom chips.
  • YELLOW: If 68000 found an error before the error trapping software (GURU) was running.
 The Keyboard has it's own processor, RAM and ROM. A selftest is performed
on power-up in the following sequence.
  1. Performs checksum on ROM's
  2. Checks 64 bytes of RAM.
  3. The timer is tested.
  4. Performs handshake with computer and gives results of self-test.
If the keyboard does not pass the test it will notify you that it is not
working properly. This information is indicated with the blinking of the
CAPS-LOCK light.
  • One Blink:    Keyboard ROM check failed.
  • Two Blinks:   Keyboard RAM checked failed.
  • Three Blinks: Watch dog timer failed
  • Four Blinks:  A short between two row lines or special control keys.
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LambdaCalculus
 
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Re: Amiga Boot-up Screen Colors and System Error Checklist

by LambdaCalculus Tue Oct 10, 2017 6:59 am

Excellent and thorough post! This should be made a pinned post, as it's super useful to all Amiga users.
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intric8
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Re: Amiga Boot-up Screen Colors and System Error Checklist

by intric8 Tue Oct 10, 2017 7:17 am

Not a bad idea. I've had to search for it a few times myself already. Done!
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Re: Amiga Boot-up Screen Colors and System Error Checklist

by mattsoft Tue Oct 10, 2017 6:30 pm

Nice compilation. Any idea what a never-ending flashing power light means?
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intric8
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Re: Amiga Boot-up Screen Colors and System Error Checklist

by intric8 Tue Oct 10, 2017 7:59 pm

Is this to do with your Wicher 500 experiments?

In the past I'm pretty sure I'd read flashing LEDs having something to do with Paula clashing with certain software. But I assume you mean from a stuck boot-up.

Like, does just your power light flash and nothing else happen?
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Re: Amiga Boot-up Screen Colors and System Error Checklist

by mattsoft Tue Oct 10, 2017 8:16 pm

intric8 wrote:Is this to do with your Wicher 500 experiments?

In the past I'm pretty sure I'd read flashing LEDs having something to do with Paula clashing with certain software. But I assume you mean from a stuck boot-up.

Like, does just your power light flash and nothing else happen?


Yeah, black screen, flashing power light, nothing else. I got it with the Wicher in a stock 1000. I can't find anything conclusive on this.
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intric8
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Re: Amiga Boot-up Screen Colors and System Error Checklist

by intric8 Tue Oct 10, 2017 9:16 pm

I would contact the creator directly. In fact, I did a few days ago (and after your tests, have cancelled my order for the Wicher at amigastore.eu, which they refunded today).

My conversation over the weekend, with Artur Gadawski:

Me: Does your software for the Wicher board run under KS 1.3?

Gadawski:
Now running only WicherDegrader under Kick1.3.
Other software requires minimum kickstart 2.05 (37.350)

Me: Once set, will the CPU stay at the desired speed after a reboot?

Gadawski:
Card configuration is maintained until power is turned off (if jumper 1 or 2 is removed.
If jumper 1 or 2 is set, after reset it is always set frequency from jumper.

I bet if you contact him directly, he'll try to help.

That card must be jamming it right at the ROM stack, before it can even get started.
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