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From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: Screen changes to green during reboot
Message-ID: <2125@cbmvax.UUCP>
Date: Thu, 16-Jul-87 12:09:37 EDT
Article-I.D.: cbmvax.2125
Posted: Thu Jul 16 12:09:37 1987
Date-Received: Wed, 22-Jul-87 02:20:38 EDT
References: <8707150441.AA03209@cogsci.berkeley.edu>
Organization: Commodore Technology, West Chester, PA
Lines: 30

in article <8707150441.AA03209@cogsci.berkeley.edu>, bryce@COGSCI.BERKELEY.EDU (Bryce Nesbitt) says:
> 
> In article <429@phoenix.PRINCETON.EDU> you write:
>>In article <603@madvax.UUCP> davidlo@madvax.UUCP (David Lo) writes:
>>
>>>   Lately, while warm booting my Amiga, I have noticed the screen 
>>>   changes to a green color for a brief moment before the "insert workbench"
>>>   message.  Does this means some parts is going to die ?
> 
> No.  Green is one of the random colors that can come up.

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.

-- 
Dave Haynie     Commodore-Amiga    Usenet: {ihnp4|caip|rutgers}!cbmvax!daveh
"The A2000 Guy"                    PLINK : D-DAVE H             BIX   : hazy
     "Catch a wave and you're sittin' on top of the world" -Beach Boys