On 2017-03-06 15:03, Timothe Litt wrote:
There were also HSC40 & hsc60.
Right. Pretty similar to all the others. The differences (as far as I
can remember) were mostly on the number of SDI/STI ports available, and
the amount of cache in the machine.
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.)
Right. However, to use the K.scsi, you actually needed to upgrade. The
HSC90 with the capability to use K.scsi was the HSC95. I don't think the
HSC70 could at all. The 40 and 60 could, I think, but I wonder if they
then were renamed 45 and 65. I think I still have some documentation
somewhere, but it would take some digging to find this.
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.
Johnny
There's a fair bit of configuration information in
http://decdoc.itsx.net/dec94mds/hscmnin2.pdf
On 06-Mar-17 08:39, Tim Stark wrote:
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 [mailto:simh-boun...@trailing-edge.com] On Behalf Of Anders Magnusson
Sent: Monday, March 6, 2017 7:33 AM
To: Johnny Billquist <b...@softjar.se>; simh@trailing-edge.com
Subject: Re: [Simh] CI750 tech docs and VAX firmware
Den 2017-03-06 kl. 11:27, skrev Johnny Billquist:
On 2017-03-06 09:51, Anders Magnusson wrote:
Den 2017-03-05 kl. 14:06, skrev Tim Stark:
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.
Hm, there is a small chance that I may have the HSC50 Cronic floppies
somewhere, is that what you are thinking about?
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.
Oh, of course! Hm, it must be for a 70 (or 90) then. Sorry :-)
-- R
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--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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