[Simh] CI750 tech docs and VAX firmware

[khandy21yo]

Nows your chance to make it happen! 


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-------- Original message --------From: Rich Alderson <simh at alderson.users.panix.com> Date: 3/7/17  12:37 PM  (GMT-07:00) To: simh at trailing-edge.com Subject: Re: [Simh] CI750 tech docs and VAX firmware 
> From: Johnny Billquist <bqt at 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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