Classicamiga Forum Retro Edition
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Thread: strange and mysterious motherboard
rbusa 12:48 13th March 2010
Just from curiosity

I saw two variants of A500: One with C= Logo near the "status lights"
and one with Commodore A500 near the "status lights"

When i whas replacing the FD Drive (by Chinon!), I found on board text like this:
Originally Posted by :
B52 / ROCK LOBSTER
CPR/JSP/CUAY/FISH
RVW/VFA/DCA
GET/LLK/ITCH/BCN
C= A500 REV 6A
And found strange thing: The power light is green instead of red and vice versa

My back sticker on case is:
Originally Posted by :
C= Commodore
MODEL A500
POWER 5V DC 4.5A 12V DC 1A -12V DC .1A
SERIAL NO. 1182420
MADE IN W. GERMANY
Funkentstört n. DBP-Vfg. 1046/84
ATTEMPTED REPAIR BY
UNAUTHORIZED PERSONS
VOIDS WARRANTY
My keyboard layout is German/Deutsch

someone knows what do that strange shortcuts mean ?
[Reply]
Buleste 14:58 13th March 2010
Does it look like this?


Here's a better image


[Reply]
rbusa 16:13 13th March 2010
exactly is it that second. I have on all custom chips C= CSG
[Reply]
Phantom 16:30 13th March 2010
CSG is Commodore Semiconductor Group, known before as MOS Technology.
[Reply]
rbusa 16:45 13th March 2010

this is CPU


This one is Paula (?)
[Reply]
Teho 17:28 13th March 2010
Originally Posted by rbusa:
And found strange thing: The power light is green instead of red and vice versa
I'm pretty sure my first A500 had a green power light and yellow disk activity light. That one was bought new in '92 (in Norway) so was a newer model. I don't have it anymore so can't check anything else for you though.
[Reply]
rbusa 18:08 13th March 2010
Originally Posted by :
I'm pretty sure my first A500 had a green power light and yellow disk activity light. That one was bought new in '92 (in Norway) so was a newer model. I don't have it anymore so can't check anything else for you though.
Yes. My miggy whas bought in Chritmas '92 it would be never model
or maby it's by layout. All countries, which have letters like Ä, Ö, Ü have the same original layout. My is QWERTZ
[Reply]
Buleste 18:14 13th March 2010
If you want to know which custom chips are which have a look here.
[Reply]
Harrison 11:12 16th March 2010
A500's were slightly different over time. The early A500's, mostly made in Germany, had red power lights, a small C= logo and the left Amiga key had the C= logo. Later A500's has the green power light, a larger Commodore A500 logo, and the left Amiga key had the more familiar Amiga A.

On earlier A500's the red power LED would also change brightness to indicate different things happening during operation.
[Reply]
rbusa 12:38 16th March 2010
Originally Posted by Harrison:
A500's were slightly different over time. The early A500's, mostly made in Germany, had red power lights, a small C= logo and the left Amiga key had the C= logo. Later A500's has the green power light, a larger Commodore A500 logo, and the left Amiga key had the more familiar Amiga A.

On earlier A500's the red power LED would also change brightness to indicate different things happening during operation.
yep. my power-state LED is changing brightness on POST and guru meditation
[Reply]
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