[GreenKeys] KSR-33 Updates

[Christian Gauger-Cosgrove]

The VT-103 (or PDT-11/110, your choice), is not one of the backplane
styles that'll enjoy being re-wired from Q18 to Q22. Also, the 11/23
series CPUs will work in Q18. I know that a Q22 CPU works in Q18 as I
have another PDP-11 (the VT-103 is my second one), which is a nice
11/23 (MMU and FPP, no CIS of course) system in a 4x9 Q18/CD BA11 box.
I'm not rewiring that as, well, it's several thousand wire-wrap
connections to turn Q18/CD into Q22 serpentine.


Also, the only PDP-11 UNIX that will run on an 11/23 or 11/23+ is UNIX
V7M. My plan is to run RT-11 (on the VT-103) and RSTS/E on the 11/23.



My main planned upgrade path for the VT-103 is replace the VT-100
boardset with a VT-125 boardset (the backplane in a VT-103 has six
locations, numbering from left to right starting at one, the QBUS
backplane starts at four and ends at six, the terminal connector is at
location one and there's a space to plug in the ReGIS board of the
VT-125 in location two), alternatively, replacing the VT-100 boardset
with the VT-102 boardset (as it is the VT-100 board with the AVO and
printer port options permanently affixed to it). Also, I shall swap
out the LSI-11/2 CPU currently in the VT-103 with my spare M8186 CPU
(11/23, MMU, no FPP, no CIS).



Cheers,
Christian




On 20 July 2011 19:56, eric <eric at limpoc.com> wrote:
> On Wed, Jul 20, 2011 at 07:42:49PM -0400, Christian Gauger-Cosgrove wrote:
>>
>> * -- I did not really clean my teletype with dimethylbenzene. That was
>> a joke, because I'm a chemistry student and chemistry jokes are
>> funny/lame. (Heh.)
>> ** -- It's a PDP-11/03 (LSI-11/2 CPU; no EIS/FIS option), currently
>> has a 256KB National Semiconductor RAM board installed (since it's an
>> 11/03 it can't see more then 64KB though, and of course, the top 8KB
>> of RAM is I/O map, so it's only really 56KB), a DLV11-J quad serial
>> line unit (four simple serial ports, at 9600 bps, SLU0 connected to a
>> virtual TU58 on my PC, SLU1 and SLU2 empty, SLU3 jumpered as console
>> and connected the VT-100 board), and a BDV11-YA bootstrap/terminator
>> board. I still have space for three more dual modules, or one quad and
>> one dual.
>
>
> i'm not sure about the backplane on the vt103 but if it is like many of
> the others you can do a simple wire wrap job to carry bits 18-22 out to
> each slot, and then plop in a 11/23+ cpu board and have a machine that
> could even conceivably boot an ancient pdp unix... not to suggest that
> you would necessarily want to, but just thought i'd mention it, as I
> vaguely recall having done a similar modification at one point.
>
>
> eric
>