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Author Topic: Description of reset 'sequence'  (Read 5938 times)

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Offline peetee

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Re: Description of reset 'sequence'
« on: June 24, 2005, 10:44:41 AM »
here are what they mean hope this helps

The first colors you will see are shades of gray .. dark gray, middle gray, light gray, and then white. The RGB color values are 0x444, 0x888, 0xAAA, and 0xCCC, in that order. Colors shown before the four gray shades are artifacts from the original values in the custom-chip registers and do not indicate a failure.
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.

Here is another interpretation of the Amiga boot colors: Above problems combinedVideo scrambled
RED   Kickstart ROM error   Two ICs in A1200, A3000, A4000
BLUE   Custom chip problem   Denise Paula Agnus
GREEN   RAM error   
YELLOW   
LIGHT GREEN   CIA (U7/U300) problem   
BLACK   CIA (U7/U300) problem   If not booting
DARK GRAY   Hardware tested OK   
LIGHT GRAY   Software tested OK   
LIGHT GRAY   CIA (U8/U301) problem   Stops at gray, CIA defective
BLACK/STRIPES   ROM or CIA   
No video   R406 or R215 open   R406=1 ohm R215=4.7 ohm
Agnus 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
and not part of the official specification, but observed by the keeper of this page:
on the A500, multiple repeated blinks indicate low voltage on the 5-volt line from the Amiga 500 power supply