[Simh] CI750 tech docs and VAX firmware

[Timothe Litt]

There were also HSC40 & hsc60. 

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.)

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.

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-bounces at trailing-edge.com] On Behalf Of Anders Magnusson
> Sent: Monday, March 6, 2017 7:33 AM
> To: Johnny Billquist <bqt at softjar.se>; simh at 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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