[rescue] New to me PDP-11/23+
Peter Stokes
peter at ashlyn.co.uk
Mon Oct 17 09:22:22 EDT 2022
Hi
You could use a TCP/IP terminal server instead with Unix? Some of them did both LAT and TCP/IP from memory, though I may be mistaken.
Peter
Sent from my iPad
> On 17 Oct 2022, at 13:48, Dave McGuire <mcguire at neurotica.com> wrote:
>
> Those terminal servers are fantastic, but that approach would require LAT on the PDP-11. That's possible, but not with any of the UNIX implementations that Steve is considering.
>
> -Dave
>
>> On 10/17/22 05:24, Brian Noonan wrote:
>> Would a DECserver 200MC be easier with LAT? I still have the boot image for that hardware in the archives..
>> *From:*rescue <rescue-bounces at sunhelp.org> *On Behalf Of *Steve Hatle
>> *Sent:* Monday, 17 October 2022 5:25 AM
>> *To:* Steve Hatle <steve.hatle at gmail.com>
>> *Cc:* The Rescue List <rescue at sunhelp.org>
>> *Subject:* Re: [rescue] New to me PDP-11/23+
>> Would this be a good option to hang some more terminals off this guy? Or - if anyone here has another solution they would part with, I'd rather keep my money in the family...
>> https://www.ebay.com/itm/185614924594 <https://www.ebay.com/itm/185614924594>
>> Steve
>> Steve Hatle <mailto:steve.hatle at gmail.com>
>> October 12, 2022 at 9:59 AM
>> I was coming to the same conclusion that this could/should be
>> considered an 11/73, since the KDJ11-B always seems to referred to
>> as the board in an 11/73. Totally likely that it was upgraded in the
>> "original" 11/23+ chassis some time in the past.
>> I will pull out one of the cards for the laser cutter and get pics
>> up soon. Since I'll be in there, I'll take photos of the Zip
>> interface card as well.
>> Dave McGuire <mailto:mcguire at neurotica.com>
>> October 11, 2022 at 10:56 PM
>> On 10/11/22 13:35, John Hudak wrote:
>> Thanks for the clarification Dave.BB 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.
>> B Ah, gotcha.B In DEC parlance, that's the "cabinet kit".B What
>> probably happened is that it was originally an 11/23, and was
>> upgraded in-chassis to an 11/73, which uses a (slightly) different
>> cabinet kit.
>> The link I posted described the connections from the on-board
>> SLU connector to the bulkhead connector.BB DEC had a number of
>> bulkhead configurations on their machines.BB 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 <https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout#10_pin_header> <https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout#10_pin_header> <https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout#10_pin_header>
>> describes the pinouts for the 10-pin Berg connector.
>> B All understood.B That's also a good reference.
>> B B B B B B B B B B B -Dave
>> John Hudak <mailto:jjhudak at gmail.com>
>> October 11, 2022 at 12:35 PM
>> Thanks for the clarification Dave.B 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.B DEC had a number of bulkhead
>> configurations on their machines.B 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 <https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout#10_pin_header>
>> describes the pinouts for the 10-pin Berg connector.
>> John
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>> Dave McGuire <mailto:mcguire at neurotica.com>
>> October 11, 2022 at 8:27 AM
>> B Just expanding on a few points below.
>> On 10/11/22 00:48, John Hudak wrote:
>> A nice system - Congrats.BB 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.
>> B Steve said he has a KDJ11-B processor board.B 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.BB This info is contained in the boot
>> proms and configured via the onboard jumpers.
>> B 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.
>> B 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.
>> B Not quite.B 2.11BSD, the last release, is the first release to
>> require split I/D space.B 2.10BSD and prior will run on the 11/23.
>> B B B B B B B B B B B -Dave
>> John Hudak <mailto:jjhudak at gmail.com>
>> October 10, 2022 at 11:48 PM
>> 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.
>> Without having my notes in front of me, the information on this
>> wikipedia page is very helpful.B From what I can remember, this
>> looks to be correct:
>> https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout
>> <https://gunkies.org/wiki/DEC_asynchronous_serial_line_pinout>
>> The pinouts on the various bulkheads show what pins on SLU
>> connector/CPU board to connect to.
>> Back in the day, I designed and built my own SLU interface/bulkheads
>> for our lab machines. If I can find my notes, I'll update the info.
>> If you haven't already, you should check out bitsavers for some very
>> useful documentation on the KDJ11-B. Specifically the KDJ11-B CPU
>> Module Users Guide EK-KDJ1B-UG-001
>> and
>> KDJ11-B CPU system Maintenance EK-247AA-MG-001
>> Useful information on how to configure the jumpers on the board, and
>> set the baud rate for the SLU.B The joys of ODT are well explained
>> in the second manual.B The User Guide does a good overview but the
>> System Maint manual has more detail
>> You can configure the CPU board to use the onboard SLU as the
>> console or another asynchronous serial card such as the DLV11-J. Not
>> sure what config you have. The manual for the DLV11-J is also on
>> bitsavers.
>> Software - I can't help much here as my machines use RL02 and I have
>> actual packs for RT11 and RSX11.B OS's can be loaded using SIMH in
>> at least a couple of ways.B There is a TU-58 emulator via a serial
>> line interface.B As you mentioned, you need to get the SLU working
>> to use it.B IIRC, there are RT and RSX-11M versions (documents and
>> compressed images , RL01 format I think). I think you will need to
>> know the disk type emulation the cpu is expecting to boot from. This
>> info is contained in the boot proms and configured via the onboard
>> jumpers.
>> Not sure how to get the images onto the zip drive.
>> IIRC, the 11/23 could only run UNIX v5, V6.B 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.
>> Good luck
>> J
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>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
> _______________________________________________
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