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PDP 11/73 in BA213 Cabinet Error

Yes, the document that DDS linked to identifies the backplane connector that goes to the signal distributor on page 1-13.

Dave
 
If you want to organise a trip to Gloucester you can see what I have to give away and you can put it (and whatever else you fancy) in the boot of your car to take away with you... My boss will be overjoyed to see more of it go!

I have just posted a list of VAX and IT stuff in the VCFED Market Place, and still have a load of peripherals and QBUS cards available that I will be listing presently.

I can’t dispose of any media though until it has been erased. I have done that with most of the VAX SCSI disks. I will erase the DSSI disks next time I am in the office, which leaves the RDxx disks to do. I am constructing a little 11/73 from bits to do that.

I did come across an interesting disk drive hiding away that you may be interested in for the museum. I can’t erase it - but I may be able to get an exemption. I will have to speak to Corporate IT Security...

You can also take a look at the two complete systems we have (no decision made yet regarding which one we are keeping and which one we are disposing of though)...

Dave
 
daver2 said:
If you want to organise a trip to Gloucester you can see what I have to give away and you can put it (and whatever else you fancy) in the boot of your car to take away with you... My boss will be overjoyed to see more of it go!

I have just posted a list of VAX and IT stuff in the VCFED Market Place, and still have a load of peripherals and QBUS cards available that I will be listing presently.

I can’t dispose of any media though until it has been erased. I have done that with most of the VAX SCSI disks. I will erase the DSSI disks next time I am in the office, which leaves the RDxx disks to do. I am constructing a little 11/73 from bits to do that.

I did come across an interesting disk drive hiding away that you may be interested in for the museum. I can’t erase it - but I may be able to get an exemption. I will have to speak to Corporate IT Security...

You can also take a look at the two complete systems we have (no decision made yet regarding which one we are keeping and which one we are disposing of though)...

Dave
Click to expand...
Will do.

I have sent you a private message.
 
SteveG said:
When powering on my KDJ11 - SC PDP 11/73 CPU in a BA213 cabinet the CPU sits with “0” displayed on the CPU (see photo).
Click to expand...

Just to be slightly more correct here, the M7554 KDJ11-D / KDJ11-S CPU would be a PDP-11/53, not a PDP-11/73.

PDP-11 Systems Handbook, 1987
Featuring: MicroPDP-11/83, MicroPDP-11/73, MicroPDP-11/53, PDP-11/84

There is a nice PDP-11 System Comparison Chart on pages 1-10 through 1-12. (There is also an 18MHz version of the 11/53 that is not included in that chart, only the 15MHz version).

Some of the main differences between an 11/53 and an 11/73 or 11/83 is that there is no cache memory on the 11/53, no floating-point coprocessor option, and no PMI memory support. On the plus side the 11/53 does have 512KB or 1MB memory on-board, and a second SLU port.
 
Thanks for the clarification !

I understand that the 11/53, 11/73, and 11/83 all share the 11/73 instruction set, hence I just used the generic 11/73 description.

I find these cards very confusing as there are so many variations.

I also find my early PDP 11’s confusing. I have PDP 11’s that have 11/05 on the front panel and one that just said PDP 11.

The power supply on the PDP 11 only box is half the size and sits beside the backplane rather than sitting at the back like the PDP11/05 and PDP 11/34.
 
Hunta said:
1.5 Mb memory
Click to expand...

Yep, that was a typo. According to Table 1-1, KDJ11 Versions, in the EK-KDJ1D-UG_KDJ11-D_May87.pdf manual, the versions are:

KDJ11-DA 512KB 15MHz
KDJ11-DB 1.5MB 15MHz
KDJ11-SA 512MB 15MHz
KDJ11-SB 512MB 18MHz
KDJ11-SC 1.5MB 15MHz
KDJ11-SD 1.5MB 18MHz

I have one that is either a KDJ11-DA or KDJ11-DB, I forget which without taking a look, and two that are KDJ11-SD. Like you, my KDJ11-SD came with DECServer 550 EPROMs. I didn't have spare 27128 EPROMs on hand at the time so I replaced the EPROMs with 27256 EPROMs with the PDP-11/53 firmware (must have been 23-261E5 / 23-262E5) doubled up twice.
 
SteveG said:
Thanks for the clarification !

I understand that the 11/53, 11/73, and 11/83 all share the 11/73 instruction set, hence I just used the generic 11/73 description.

I find these cards very confusing as there are so many variations.
Click to expand...

There is a nice table of the different DCJ11-based CPU boards here:

It is confusing that the quad-wide M8190 and dual-wide M8192 can both be considered an 11/73, and the quad-wide M8190 can be considered either an 11/73 or 11/83 (or an 11/84 when used in a UNIBUS system).
 
As the M7554 - SC does not appear in this table it is still unclear if this card is an 11/53 or an 11/73.
This is what I found in Wikipedia:-

  • MicroPDP-11/73 – The third generation LSI-11, this system uses the faster "Jaws-11" (J-11) chip set and supports up to 4 MB of memory.
  • MicroPDP-11/53 – Slower 11/73 with on-board memory.
  • MicroPDP-11/83 – Faster 11/73 with PMI (private memory interconnect).
As this CPU has the same 15 MHz clock rate as an 11/73 I assume the simple table above would classify it as an 11/73.
 
M7554 KDJ11-DA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LTC
M7554-01 KDJ11-DA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LTC (VE)
M7554-02 KDJ11-DB 11/53-PLUS CPU 15 MHz, 1.5 Mbyte RAM, 2 SLU, LTC
M7554-04 KDJ11-DD J11 CPU 18 MHz, 1.5 Mbyte RAM, 2 SLUs (CSS)
M7554-PA KDJ11-SA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle
M7554-PB KDJ11-SB J11 CPU 18 MHz, 512 kbyte RAM, 2 SLUs, LAT PROM, with S-box handle
M7554-PC CMR53-AA J11 CPU 18 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle, CMR53 boot PROM
M7554-SA KDJ11-SA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle (VE)
M7554-SC KDJ11-SC J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle (VE)
M7554-SD KDJ11-SD J11 CPU 18 MHz, 1.5 Mbyte RAM, LAT ROM, with S-box handle
M7554-SE KDJ11-SE J11 CPU 18 MHz, 1.5 Mbyte RAM, 2 SLUs, LTC, with S-box handle
M7554-YA KDJ11-SA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LTC, no handle
M7554-YB KDJ11-SB J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LAT PROMs, no handle

 
Formally, the board type is identified by the contents of the maintenance register (17777750) - code 0100 - PDP-11/53, 0001 - PDP-11/73, PDP-11/83(84) - 0010, PDP-11/93(94) - 0101
 
Hunta said:
M7554 KDJ11-DA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LTC
M7554-01 KDJ11-DA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LTC (VE)
M7554-02 KDJ11-DB 11/53-PLUS CPU 15 MHz, 1.5 Mbyte RAM, 2 SLU, LTC
M7554-04 KDJ11-DD J11 CPU 18 MHz, 1.5 Mbyte RAM, 2 SLUs (CSS)
M7554-PA KDJ11-SA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle
M7554-PB KDJ11-SB J11 CPU 18 MHz, 512 kbyte RAM, 2 SLUs, LAT PROM, with S-box handle
M7554-PC CMR53-AA J11 CPU 18 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle, CMR53 boot PROM
M7554-SA KDJ11-SA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle (VE)
M7554-SC KDJ11-SC J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, with S-box handle (VE)
M7554-SD KDJ11-SD J11 CPU 18 MHz, 1.5 Mbyte RAM, LAT ROM, with S-box handle
M7554-SE KDJ11-SE J11 CPU 18 MHz, 1.5 Mbyte RAM, 2 SLUs, LTC, with S-box handle
M7554-YA KDJ11-SA J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LTC, no handle
M7554-YB KDJ11-SB J11 CPU 15 MHz, 512 kbyte RAM, 2 SLUs, LAT PROMs, no handle

Click to expand...
Ok I have it now.

If you ignore the KDJ11 Model number and consider the Module Number it becomes simple:-

M7554 = PDP 11/54
M8192 or M8190 = PDP 11/73
M8190 or M8191 = PDP 11/83
 
M8192 -> PDP 11/73 (PDP-11/73A)
M8190, 15 MHz no PMI memory -> PDP-11/73B (PDP-11/73+)
M8190, 18 MHz PMI memory, QBus -> PDP-11/83
M8190, 18 MHz PMI memory, Unibus -> PDP-11/84
 
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Transformations of my M8190.

When I bought it, it was M8190-AB (KDJ11-BB) 15 MHz, without FPA.
I changed the 15MHz quartz to an 18MHz quartz and replaced the processor and the board became M8190-AD (KDJ11-BA).
Then I added an FPA and the board became M8190-AE (KDJ11-BF).
And then I changed the 18 MHz quartz to 24 MHz quartz and the board became M8190-?? (KDJ11-??).

Everything is relative in this world :)
 
SteveG said:
Ok I have it now.

If you ignore the KDJ11 Model number and consider the Module Number it becomes simple:-

M7554 = PDP 11/54
M8192 or M8190 = PDP 11/73
M8190 or M8191 = PDP 11/83
Click to expand...

minor correction:

The M8190 KDJ11-B could be a PDP-11/73 or PDP-11/83 in a Q-Bus system, or a PDP-11/84 in a UNIBUS system.

The M8191 is the KTJ11-B UNIBUS adaptor used with the KDJ11-B and KDJ11-E Q-Bus CPU cards to add UNIBUS capability to systems built around those CPU cards, the PDP-11/84 and PDP-11/94 systems respectively.

The M8981 KDJ11-E is a PDP-11/93 in a Q-Bus system, or a PDP-11/94 in a UNIBUS system. Those were the top of the KDJ11-based PDP-11 CPU boards from DEC. Mentec also had some KDJ11-based PDP-11 CPU boards.

(There is also the M7616 KXJ11-CA single-board computer, which was designed primarily to be used as an I/O processor, not something that would run a normal OS).
 
Hunta said:
M8192 -> PDP 11/73 (PDP-11/73A)
M8190, 15 MHz no PMI memory -> PDP-11/73B (PDP-11/73+)
M8190, 18 MHz PMI memory, QBus -> PDP-11/83
M8190, 18 MHz PMI memory, Unibus -> PDP-11/84
Click to expand...
The first four slots in an 11/84 are Qbus slots. Thus it really is an 11/83 CPU. There is no such thing as an 11/84 except sold as a system.
 
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