DEC PDT-11/150

This is an unusual one. The PDT-11/150 is one of a series of “smart terminals” based on the PDP-11/03’s LSI-11 chip set and so is basically a little PDP-11 atop a pair of massive 8″ disk drives.

It came to me from a friend who presides over a massive collection but is still, like the rest of us, unable to keep everything. His collection is mostly home machines and quite game focused and this business machine doesn’t fit and so I got a message.

This is just the kind of thing I love. The left-field, unloved and under appreciated machines like this are just the cut of my jib.

Details

Looking on the net there is not a lot of details on this one but according to the manual has 16 or 30 (sic) k-words of RAM, 2  8″ floppy drives and 6 serial ports. The processor is the LSI-11 in 3 chips.

From the front the machine is dominated by the floppy drives. The processor and all it’s additions are under the small “lid” and behind the smart label…

The state of things.

It’s not working… I don’t think there is much wrong with it as when I apply power, the disks make moving noises, the LEDs on the front light and go out but I can’t get any life out of the serial port and onto my PC that’s running a serial terminal.

Things to do.

The run mode switch on the back had been bent and become a bit flaky. I’ve replaced it with a new one (RS part number 7109551) but it didn’t make it run properly. It did give me a feeling of satisfaction though 🙂

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