18 Oct
2023
18 Oct
'23
2:32 p.m.
On Oct 18, 2023, at 10:20 AM, Henry Bent via cctalk
<cctalk(a)classiccmp.org> wrote:
On Wed, 18 Oct 2023 at 10:16, Bill Gunshannon via cctalk <
cctalk(a)classiccmp.org> wrote:
There are two possible issues. One is that SCSI is a packet oriented storage
command/response system similar to MSCP but different. So the kind of controllers Bill
mentioned are essentiallly translators between the two protocols.
If what you have is a native SCSI controller -- one that exposes the actual SCSI commands
-- then that requires an entirely different driver because that isn't MSCP.
If you have an MSCP translator type controller, but the translation is poorly done, you
might end up with it failing for some operating systems. That's not too unlikely
given that the MSCP spec was for a long time a DEC confidential document, so third parties
had to reverse engineer things (and dodge DEC lawyers).
paul
On 10/18/2023 10:00 AM, Henry Bent via cctalk wrote:
hardware
Interesting. My Dilog DQ614 (ST506 emulating RL02s) specifically does not
work with Ultrix, but does work with 2.xBSD and v7, so I would not
necessarily assume that a third-party board was going to work with
Ultrix-11's drivers. On Wed, 18 Oct 2023 at 09:56, hupfadekroua via
cctalk <
cctalk(a)classiccmp.org>
wrote:
> Hello all,
>
> does someone have a SCSI disc image of Ultrix 11 for a QBus based
(11/73)
PDP11.
Ultrix-11 doesn't support SCSI disks, as far as I am aware. What are you trying to use? In any case, you can
easily use SIMH to install
3.1
(or your preferred version) and then transfer
that to real hardware.
PDP-11 SCSI Modules emulate MSCP and RA disks and work fine with
Ultrix-11.