Date   : Fri, 01 Jul 2005 12:55:18 +0000
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Re: Acorn SCSI controller schematic

On Fri, 2005-07-01 at 13:25 +0100, Darren Grant wrote:
> Which one the internal master one is here bust I suspect you mean the SASI
> one.
> 
> http://www.microcomputer.org.uk/documents/index.php

that's useful too :)  I'm just pondering options for driving SASI
devices from a PC parallel port (if possible) in order to back up drives
on some of my classic systems - so I'm just looking at the different
interfaces out there at the moment to see how they did it.

Main issue is the lack of signal lines on a parallel port - only three
outputs for control and five inputs (ignoring the 8 bit data bus). I'm
hoping with SASI there are enough signal lines to avoid messing around
with clocking stuff into registers a few bits at a time! (ISTR looking
at this for SCSI a while back and there aren't quite enough lines
present to make a simple interface)

cheers

Jules