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.

Open

Picture from here, where there is also way more information.

To test the Unibone we need it in a terminated backplane like the DD11-CK:

Open

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:

• Unibus - pinout

• SPC Slots pinout

• Backplane types - overview

• Unibone DD11 backplanes - detailed slot descriptions