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-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 > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh > > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh
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