[rescue] New to me PDP-11/23+

[John Hudak]

Thanks for the clarification Dave.  About the bulkhead, I was not referring
to the on-board connectors on the KDJ11-B. When the OP mentioned 'bulkhead'
I thought he meant the circuit board that contains DB9, DB25, etc. which is
usually bolted to the chassis. The link I posted described the connections
from the on-board SLU connector to the bulkhead connector.  DEC had a
number of bulkhead configurations on their machines.  In any case, I
re-read the OPs post and realized his system does not have the bulkhead
connector, on the two 10-pin Berg/IDC connectors on board.
To clarify things, the link I posted:
https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout#10_pin_header
describes the pinouts for the 10-pin Berg connector.

John




On Tue, Oct 11, 2022 at 9:27 AM Dave McGuire <mcguire at neurotica.com> wrote:

>    Just expanding on a few points below.
>
> On 10/11/22 00:48, John Hudak wrote:
> > A nice system - Congrats.B  This should keep you entertained for hours.
> > The bulkheads for console SLU differed according to what the machine was
> > (Qbus, Unibus) and they varied within the backplane family.
>
>    Steve said he has a KDJ11-B processor board.  This processor has two
> onboard SLUs which use the 10-pin connectors, not the 40-pins.
>
> > I think you will need to know the disk
> > type emulation the cpu is expecting to boot from.B  This info is
> > contained in the boot proms and configured via the onboard jumpers.
>
>    There's virtually no chance of it being anything other than MSCP.
> Several companies made Qbus SCSI host adapters; all of them (or nearly
> so) implement MSCP.
>
> > Not sure how to get the images onto the zip drive.
>
>    dd
>
> > To run BSD 2.x requires
> > separate I&D space and the usual upgrade was to exchange the 11/23 cpu
> > board for a 11/73 board.
>
>    Not quite.  2.11BSD, the last release, is the first release to
> require split I/D space.  2.10BSD and prior will run on the 11/23.
>
>              -Dave
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
>
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