Here’s a little more information about the PDP-11/35.
It came to me with the following peripherals:
- ECCO Paper Tape Reader
- Diablo Series 30 disk drive — compatible with DEC RK05
- Applied Engineering 2200 Disk Controller for the Diablo Series 30
- Data System Designs DSD 440 floppy disks — compatible with DEC RX02
- DEC H750 Power Supply
There are three backplanes (or “System Modules”, as DEC called them) installed. The first is a 9 slot KD11-A, the second is a 4 slot MM11-S, and the third is a 4 slot DD11-A. The MM11-S is interesting in that it suggests that the 11/35 originally came with the MM11 16KW core memory option, though somewhere along the line that was upgraded to MS11 MOS memory.
Here’s the layout:
|03||M7232 – KD11-A 11/40 Micro Word Module|
|04||M7231 – KD11-A 11/40 Data Paths Module|
|05||M7233 – KD11-A 11/40 IR Decode Module|
|06||M7235 – KD11-A 11/40 Processor Status Module|
|07||M7234 – KD11-A 11/40 Timing Module|
|09||M981 Jumper||M7800 Async Serial|
|11||M7847-BD – MS11-EP 16KW RAM 1|
|12||M7847-DJ – MS11-JP 16KW RAM|
|14||DSD 440 Floppy Controller|
|15||ECCO Paper Tape Reader|
|16||G772B||M7800 Async Serial|
- The MS11-JP module is normally an 8KW board, but this one has been field upgraded to 16KW of MOS RAM, minus parity bits on the upper 8KB.