Unibus, Uniprobe and Unibone tales
As my PDP-11 came without peripherals I need something to make it come alive..
Unibus information
There are multiple parts inside an Unibus:
- UNIBUS Slots are the real Unibus
- SPC are slots usually reserved for peripheral cards?
In addition, there are two versions of Unibus. Normal Unibus and modified Unibus. These are not compatible! In “newer” PDP-11’s both of these are present on the backplane, and it is a bad idea to use boards meant for the one in the other.
Picture from here, where there is also way more information.
The backplane for the 11/44
This is a special backplane for the 11/44's KD11-Z processor. It is a 14-row backplane with a VERY special configuration. Its configuration is as follows:
| Row | A B | C D E F |
|---|---|---|
| 1 | M7090 CIM | CIS M7091 (optional) |
| 2 | CIS M7092 (optional), 6x | |
| 3 | FPP M7093 (optional), 6x | |
| 4 | Data Path M7094 | |
| 5 | Control M7095 | |
| 6 | Multifunction M7096 | |
| 7 | Cache M7097 | |
| 8 | Unibus IF M7098 | |
| 9 | EUB Memory | |
| 10 | EUB Memory | |
| 11 | EUB Memory | |
| 12 | EUB Memory | |
| 13 | Mod Unibus device slot | |
| 14 | Terminator M9302 | Leave empty |
Unibone testing using a stand-alone backplane
To test the Unibone we need it in a terminated backplane like the DD11-CK:
We need two passive terminators (M930, donated by Geert):
Login to the Unibone with:
ssh root@ip
password: root
Follow the test instructions from here
More information: