From: rforster@galaxy.gov.bc.ca (Russ Forster)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: My AMIGA is now CYAN ONLY!!!
Date: 28 Aug 92 17:21:00 -0700
Organization: BC Systems Corporation

In article <jyork.714365075@pv343d.vincent.iastate.edu>, jyork@iastate.edu (Justin York) writes:
> 
> Can anyone out there tell me what has happened to my Amiga? I moved it up
> to college (no more bumps than normal...) and when I  hooked it up, the 
> monitor displays only shades of cyan! I have tried re-setting the monitor
> controls, and have tried different cables, so my conclusion is that it it
> 
> A) The 1084S telling me it will soon be leaving me :(
> 
> or
> 
> B) The Denise chip telling me it is time to upgrade :)
> 
> 
> SO, if this sounds familiar, please tell me what you did to solve it...
> 
> 					Thanks,
> 					Justin York
> 					jyork@iastate.edu

	Here is some documentation that may help you.  I've kept this around
	for ever, I hope the information is not out of date.

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Actually, green is meaningful in the right context.  On initial powerup, the
first meaningful color displayed is dark grey, which indicates the system
has passed the "hardware test".  The 68000 is running, and some hardware
registers are seen.  Next is the light grey screen, the "software test",
where the system software is starting to come up.  Finally, the "white"
screen comes up indicating that the machine is just about ready to ask for
a disk everything has checked out OK.

Failures come up as colors.  Green indicates a CHIP RAM failure of some kind.
Red indicates a ROM/WCS failure.  Blue indicates a custom chip failure.
And yellow indicates that a 68000 exception trap has occurred before the
normal OS trap handler (the GURU code) has been installed.  When a failure
is detected, the OS will often retry, so you can see cycling from failure to
test, at least for the right kind of failures.

  Dark gray     Ok Hardware
  Light gray    Ok Software
  Red           Bad ROM Checksum
  Green         Bad RAM
  Blue          Bad Custom Chips
  Yellow        Exception

>What does the Amiga do when you reboot?

This should be in the 'most asked questions' posting, along with
"what does color X mean on startup?"

- Clear Chips      (screen turns blue on custom chip failure)
- Disable DMA and Interrupts
- Clear the Screen
- Check the Hardware
- Pass or fail the Hardware to the Screen (dark grey if OK)
- Checksum the WCS (OS does not checksum the ROM)
- Pass or fail the WCS to the Screen (displays "Insert Kickstart" screen)
- System setup
- Check the for RAM at $C00000
- Move SYS_BASE to $C00000 if it exists
- RAM Test
- Pass or fail the RAM to the Screen (green if bad)
- Check the Software
- Pass or fail the Software to the Screen (light grey if OK)
- Set up the RAM
- Link the Libraries
- Find External RAM and link it to the list
- Set up Interrupts and DMA
- Start default Task
- Check for 68010, 68020, and 68881
- Check for an Exception (screen yellow if found and GURU handler not set up)
- System Reset


The Keyboard has it's own processor, RAM and ROM. A selftest is
peformed 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 selftest.

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  Watchdog timer failed

Four Blinks  A short between two row lines or special control keys.

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-- 
Regards,

Russ Forster (postmaster), Sr. Technical Analyst, MultiVendor Group
BC Systems Corp., 4000 Seymour Place, Victoria, B.C., V8X 4S8
Internet: RForster@Galaxy.Gov.BC.CA       Phone: (604) 389-3186