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Hello World ASR 33 Test

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  by Bill Degnan - 10/21/2015 09:08
PDP 11/05 prior to configuring for Teletype. Click for larger image.

Attaching a teletype to the PDP 11/05 S is nearly the same as the 11/05 NC.

First verify that your M7260 CPU card (the one with the front panel cable) switch S1 is pointing to position 5 (and not backwards pointing to #2).

Next attach Berg end of the relatively short 70-08360 cable to the M9970 card installed in slot A-B (not C-D!). NOTE: I also have a GC card installed in slot D of the same card row.

Attach the other end of the 70-08360 cable mate-n-lock connector to the teletype. You can read more about this
here. What is most important is to be sure mate-n-lock pin 7 attaches to terminal strip connector 4 on the teletype. pin 5 goes to terminal strip connector 7, pin 3 goes to terminal strip connector 4, and pin 2 goes to terminal strip connector 3.

If you connect your computer to the teletype in LINE mode, power on the computer, and the teletype stops chattering you at least have a current loop.

Next, run the Hello World program from the front panel. Hello World! directions. Remember after toggling in the program to start from 001020. A lot of little things can go wrong, but you can learn more here: Teletype 101.


I was able to get this working.

At this point I have a system that can interact with a teletype for I/O.

TTY I/O Echo Characters Demo

NEXT: Memory is not stable.

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