Re: Early Amiga 200

From: silverdr_at_wfmh.org.pl
Date: Sat, 23 Nov 2013 15:46:08 +0100
Message-Id: <F44BCB38-14CE-4B2D-A2E9-EA662F684CB1@wfmh.org.pl>
>>> Good call: There is a sticker near the front that says Rev 6.2 and the
>>> copper near the back next to Fish and Haynie''s name is Rev 6
>> 
>> AFAIR that’s not a very early one then. If memory serves, it was Rev. 5, which was a already a common guest in my repair workshop back then. Most visible difference was the RAM x64 vs. x256 in the newer ones.
>> 
> 
> This version had 1 MB on board, in 32 x 256Kx1 DRAMs, 512KB Chip-RAM, 512KB $C00000-RAM.
> [...]
> Then came the Rev 6 boards with the new AGNUS (8372A) that was able to supply 1 MB of Chip-RAM and handle the refresh for the 8x 256Kx4 DRAMs

Not x64 vs. x256 but 1x256 vs 4x256 - right. The bank size differences were strikingly visible.

> All the mainboards I know of this were Rev 4.x (4 to 4.5).

I’d bet there were some “fives”. Would have to dig the junk pile to see what’s left there but maybe the “5”, I vaguely recall, comes from “4.5” markings..

> rework (remove pullups, add pulldowns or such and some other small parts) which was known as the Rev 6.2

Which works very well - I used a couple of those in a TV/animation studio standing beneath a Silicon Graphics workstation. Amigas did all the job and and SGI did the right impression :-)

-- 
SD!
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Received on 2013-11-23 15:03:24

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