Re: Unknown 1541 add-on card

From: Gerrit Heitsch <>
Date: Wed, 26 Jun 2013 20:55:00 +0200
Message-ID: <>
On 06/26/2013 08:13 AM, Baltissen, GJPAA (Ruud) wrote:
> Hallo allemaal,
> Patryk wrote:
>> Was it found working in a 1541?
> It was donated to the club some time ago together with some other loose stuff. Thus not built in one or another device. I just assumed it was meant for the 1541 because I knew there existed cards with 512 KB of DRAM onboard.
> But I just realised I completely forgot to mention something: the pins on the solderside meant to be stuck in the socket of the CPU are about 4 cm long. IMHO that is too long to close the cover. ????

Here's some more information I was able to dig up... The Original TT 3.0 
came out in 1986. On your PCB, the datecodes of most ICs are from 1988 
and 1989. So your PCB could be a later revision of the TT design or a 
special version meant for a disk copy station.

I also found a mention of a TT 3.4 that used a split PCB but was so far 
unable to dig up a photo.

Also, they claim that TT 3.x also worked without a parallel cable and 
you got at least a 20x speedup through the standard serial cable.


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Received on 2013-06-26 19:01:32

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