I acquired an LSI-11/23 processor board (M8186) from Weird Stuff Warehouse just before they closed up shop. Actually getting this running turns out to be non-trivial. In addition to the processor board, here's what's needed:
- A backplane. The processor and other cards plug into this
- A power supply. Needs to supply +5V and +12V
- A serial port
Those are all readily available. But it doesn't quite stop there. There are a couple of signals that need to be present for the thing to operate, so *something* is required to generate these signals. In particular, the signals BDCOK and BPOK, which are generated by the power supply on original DEC machines, need to be present with proper timing:
Note the wire wrap pins for configuration. This board only supports 18-bit addressing, so if I ever want to take advantage of the full 22-bit address space that the processor and bus support, I'll have to replace it with one or more other cards.