Re: 1570 disk drive DEVICE NOT PRESENT ERROR

From: Gerrit Heitsch <>
Date: Tue, 10 Jul 2012 21:17:54 +0200
Message-ID: <>
On 07/10/2012 09:08 PM, Anders Carlsson wrote:
> I would suspect either a 6522 VIA or 6526 CIA. I saw the 1571 has two
> 6522 and one 6526, not sure about the 1570 but I suppose something
> similar? I didn't quite figure out which one handles the IEC
> communcation with the computer, but I think it is the 6526?

The 6526 handles only the burst mode with its shift register, it's 
otherwise unused. So normal IEC is done with one of the 65C22.

The 1570 uses the same PCB as the 1571.


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Received on 2012-07-10 20:00:27

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