[Simh] CI750 tech docs and VAX firmware

[Tim Stark]

Ok, I now got it. I downloaded and reviewed scanned docs that Tim Litt pointed to.  Yes, HSC70 is upgradable to HSC90. 

I will start with HSC70/90 emulation development then HSC50 and others...

Also I learned that CI became DSSI (SCSI version of CI) later.  They provides SHAC tech docs for VAX 4000 series (KA660 to KA690) and others.

Does anyone have HSJ tech docs for DSSI and SCS/SCA packet docs?

Thanks again,
Tim

-----Original Message-----
From: Simh [mailto:simh-bounces at trailing-edge.com] On Behalf Of Johnny Billquist
Sent: Monday, March 6, 2017 6:43 PM
To: simh at trailing-edge.com
Subject: Re: [Simh] CI750 tech docs and VAX firmware

On 2017-03-06 14:39, 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.

The HSC90 is pretty similar to the HSC70. I would have to go and check more documentation, but I think the HSC70 was upgradeable to a HSC90.
I think the HSC90 had much more cache memory, but they both certainly use the J11, and the same modules for SDI and STI, along with the CI.

The HSC90 can have more ports though. But there is not a whole lot of difference.

	Johnny