Re: DD2 & 3

From: silverdr_at_wfmh.org.pl
Date: Wed, 19 Jun 2013 11:54:08 +0200
Message-Id: <D3C271B2-7C0C-4A4E-B495-4529D0F7D135@wfmh.org.pl>
On 2013-06-18, at 19:21, Nicolas Welte wrote:

> The same PCB was also used in the 1570 and 1571 versions of DD3, and even in the C128DCR version. The DCR drive has no free I/O lines at all, and the 1570/71 has only free lines on the CIA chip. To avoid having a different PCB for each 1541 version, and also for each 1570/1571/C128D/C128DCR version, they used the approach with the 6821 PIA.

Do you know why they tapped on the A1-A4? Is there something peculiar in any of those other drives that would require this?

-- 
SD!
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Received on 2013-06-19 10:01:15

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