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There were also HSC40 & hsc60. <br>
<br>
The differences in the hsc family members were the processor, cache,
load device, number of channels, and maximum number of ports. Some
models were field-upgradable. Also, later models supported
(reluctantly) the K.scsi module, which allowed the HSC to serve SCSI
disks and tapes. (SCSI was carefully analyzed & found to have
reliability/data integrity issues; DEC's answer was DSSI. Rather
like Beta & VHS - "good enough, but cheaper" won.)<br>
<br>
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.<br>
<br>
There's a fair bit of configuration information in
<a class="moz-txt-link-freetext" href="http://decdoc.itsx.net/dec94mds/hscmnin2.pdf">http://decdoc.itsx.net/dec94mds/hscmnin2.pdf</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 06-Mar-17 08:39, Tim Stark wrote:<br>
</div>
<blockquote cite="mid:000001d2967f$15e15e70$41a41b50$@verizon.net"
type="cite">
<pre wrap="">I reviewed HSC50/70 tech docs. Yeah. They are PDP-11 machines. HSC50 uses TU58 and is F11 processor. HSC70 uses floppy drive and is J11 processor.
They uses SDI and STI devices through two Qbus registers with MSCP/TMSCP packets.
I am interested to get copies of floppy and tape images for loading software.
I have not find HSC90 tech docs yet.
Thanks,
Tim
-----Original Message-----
From: Simh [<a class="moz-txt-link-freetext" href="mailto:simh-bounces@trailing-edge.com">mailto:simh-bounces@trailing-edge.com</a>] On Behalf Of Anders Magnusson
Sent: Monday, March 6, 2017 7:33 AM
To: Johnny Billquist <a class="moz-txt-link-rfc2396E" href="mailto:bqt@softjar.se"><bqt@softjar.se></a>; <a class="moz-txt-link-abbreviated" href="mailto:simh@trailing-edge.com">simh@trailing-edge.com</a>
Subject: Re: [Simh] CI750 tech docs and VAX firmware
Den 2017-03-06 kl. 11:27, skrev Johnny Billquist:
</pre>
<blockquote type="cite">
<pre wrap="">On 2017-03-06 09:51, Anders Magnusson wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Den 2017-03-05 kl. 14:06, skrev Tim Stark:
</pre>
<blockquote type="cite">
<pre wrap="">
Folks,
I discovered CI750 tech docs when I searched for some CPU processors
for VAX emulation. I downloaded and reviewed it. CI emulation can
be implemented for emulator to link to other VAX/Alpha emulators as
VMScluster. Does anyone find CI780 emulation for VAX-11/780 and VAX
86x0 yet? Also I found HSC 50/70 tech docs but do not have software
at this time.
</pre>
</blockquote>
<pre wrap="">Hm, there is a small chance that I may have the HSC50 Cronic floppies
somewhere, is that what you are thinking about?
</pre>
</blockquote>
<pre wrap="">
Heh. If it's for the HSC50, it will be DECtape II.
We might still have a set around at Update, but it's been years since
I saw them, and we don't have any HSC50 anymore. We still have a HSC90
though, with the floppy.
</pre>
</blockquote>
<pre wrap="">Oh, of course! Hm, it must be for a 70 (or 90) then. Sorry :-)
-- R
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</pre>
</blockquote>
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