Published Monday, April 30 2012
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:
| Slot | Contents |
|---|---|
| 01 | |
| 02 | |
| 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 |
| 08 | |
| 09 | M981 Jumper, M7800 Async Serial |
| 10 | |
| 11 | M7847-BD - MS11-EP 16KW RAM1 |
| 12 | M7847-DJ - MS11-JP 16KW RAM |
| 13 | M920 Jumper |
| 14 | DSD 440 Floppy Controller |
| 15 | ECCO Paper Tape Reader |
| 16 | G772B, M7800 Async Serial |
| 17 | M9302 Terminator, G727A |
- 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.
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