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-------- Original message --------From: Rich Alderson
<s...@alderson.users.panix.com> Date: 3/7/17 12:37 PM (GMT-07:00) To:
simh@trailing-edge.com Subject: Re: [Simh] CI750 tech docs and VAX firmware
> From: Johnny Billquist <b...@softjar.se>
> Date: Tue, 7 Mar 2017 00:47:08 +0100
> On 2017-03-06 15:03, Timothe Litt wrote:
>> At some point, support for 18-bit disks (576 byte sectors) was dropped. The
>> HSC50 definitely had it; the HSC90 did not. I'm unsure about the HSC70.
> Unless I remember totally wrong, only the HSC50 could do 576 byte sectors.
> It was dropped in a pretty early version of CRONIC, before support for any
> other HSC controller existed.
Correct. Only the HSC50 ever supported 576-byte sectors, and only on RA81 and
smaller drives. (We really wanted RA82s on our 4-system CI cluster at Stanford
LOTS, but were informed that it would never ever happen.)
Rich
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