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| From: Richard Atkinson
Date: 2000-08-17
Subject: Re: 1551 programming
|
On Thu, 17 Aug 2000, Zsolt Prievara wrote:
> I'm back with new questions. Has anybody documentation about the C1551 drive
> internals functions? What commands can it accept at the $FEF0 ports?
This would be very interesting to me too. The ROM is on Funet and I know the hardware that connects the 1551 to the main processor - but I have no idea what runs across that bus in normal kernal routines. Presumably it's another variant of the IEEE-488 protocol, but almost certainly cut down a lot from the original PET implementation. Perhaps it's an 8 bit data bus with a CLOCK line and an ACK line, similar to the 1541 but with a parallel data connection. This is pure speculation; I would be very interested to see real 1551 documentation, or even 1551 schematics.
Richard
--
Richard Atkinson Software Engineer Tenison Technology EDA Ltd http://www.tenisontech.com/
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