PDP-11 Memory

[Bill Gunshannon]

On 1/12/19 2:25 PM, allison via cctalk wrote:
> On 01/12/2019 12:29 PM, Pete Turnbull via cctalk wrote:
>> On 12/01/2019 01:24, Zane Healy via cctalk wrote:
>>
>>> I’m pretty sure you could get the /23+, /53, /73, /83, and /93 in
>>> either a BA23 or a BA123.  I have an actual badged BA23 pedestal for
>>> my /23+.
>>
>> I'm fairly certain all microPDP-11/23+ systems were only sold in BA23
>> boxes, and I think microPDP-11/73 and the later, cheaper, cut-down
>> 11/53 were as well.  But almost all the 11/83 systems I've ever seen
>> were in BA123 boxes, though they did sell some in BA23 pedestals -
>> I've got one.
>>
> Pete,
> 
> Your right the 11/23+ showed up on a lot of boxes but not the BA123
> though it would fit.  

My 11/23+ is in a box labeled PDP-11/23PLUS on the front with
three toggle switches.  :-)  It has a 9276-A backplane labeled
OPTION 11/23B. It is a 9 slot, Q22 A-B-C-D .  That's the home
for my next system which will (hopefully) have 2 meg of memory,
a DEQNA and an Andromeda Card for a small hard disk and 8" floppy.

I also plan on another small 11/23 with 128KW of memory and an
18 bit backplane so I can use the RX02 emulator.  And, probably
an Andromeda in there, too


To bring my part of this discussion to an end, I now have a BA23
MicroPDP box with an 11/73 CPU, 4 meg of memory, DHV11 for eight
serial lines (probably only use one to talk to a TU58 emulator
but the DHV11 was just sitting there looking lonely) a DEQNA
and a CMD SCSI Controller set for 6 disks and one tape.  Only
thing it lacks at this point is software.

On to my next project.

Thanks for all the help.  I had forgotten just how much fun
real computers were compared to PC's and MAC's.

bill