Diagnostic Test
The screen colour after power-on shows the result of the self-test.
If everything is working the following screen colour sequence will be displayed:
- Dark grey - Hardware working and the registers are readable.
- Light grey - ROM verified.
- White - Initialization is alright. Ready to boot.
These colours indicate a problem:
- Red - Bad kickstart-ROM
- Green - No chip RAM found or is damaged
- Blue - Custom chip problem (Denise, Paula, Agnus)
- Yellow - Mostly a bad CPU (no trap routine) or a bad Zorro expansion card. CPU exception error before the "guru meditation" trapping software was enabled.
- Light green - CIA problem
- Light Grey - If stops at Grey that the CIA can be defective
- Black/stripes - ROM or CIA problem
- Black (no video) - Really basic problem.
The keyboard LED uses blink codes where:
- One blink means the keyboard ROM has a checksum error
- Two blinks means RAM failure
- Three blinks means watchdog timer failure.
- When the caps lock key is repeatedly pressed approx. 10 times, the caps lock LED turning on and off each time indicates the CPU is correctly reading the CIAs. If the caps lock LED sticks on or off, the CPU is not servicing CIA interrupt requests.
Read more about this topic: Kickstart (Amiga)
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