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.

From retrocmp: a backplane with the three regions colour coded, standard Unibus in red at the bottom, modified Unibus in blue above it, and the SPC slots in yellow.

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:

The Unibone seated in the DD11-CK with the BeagleBone on top, the M930 terminator visible in the slot at the right, and a PC supply standing by for power.

We need two passive terminators (M930, donated by Geert):

One of the two M930 terminators, component side, with the CTS resistor packs and the 13-12628 arrays that do the terminating.

The solder side of the same board, where the BUS TERMINATOR M930 legend is etched into the copper.

ssh root@ip

password: root

Follow the test instructions from here

More information: