RE: My finding about the 90x0 ROMs

From: Baltissen, GJPAA (Ruud) <>
Date: Thu, 17 Feb 2011 10:07:20 +0100
Message-ID: <>
Hallo allemaal,

I want to adjust my findings about the 90x0 not supporting multiple
drives. I already mentioned the fact that the BC doesn't combine the job
and drive number, something even the 1541 does.

I also told you that when addressing the SASI controller, the DC always
uses address 1. Yesterday evening I found out that the DC also has
reserved a variable for the drive number. It is used everywhere inside
the ROM except for the moment the SASI controller has to be addressed. A
bit weird: the BC only supports two drives but the DC up to four!

What I really like about the 90x0 is that it has an EPROM instead of a
6530 which means one can reprogram things quite easily. For someone like
me, not having a working SASI controller and not yet having figured out
what the DC sends to the controller, this means I can program my own
interface but also make use of multiple hard disks.

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Received on 2011-02-17 10:00:09

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