Entering and Running a Tiny Program from the PDP-11 (PiDP-11) Front Panel
Last post I manually entered machine code into the simH PDP-11 using simH commands. That can be seen here:
This post I’m going to enter and run the same program, that adds 1+1, using the PDP-11 front panel.
I’m not going to go over the program again, that can be seen in the prior post.
This manual, the PDP-11/70Processor Handbook, is the official documentation for the system but it doesn’t spend much time discussing the front panel.
This has a much better explanation
I really can’t explain, in writing, the process better than the above document, BUT I did create a video where the 1+1 program is entered into memory, run, then the results are displayed.
Note, in the video at 04:50, I look at memory location 1006 to verify it is 0 before running the program. I was supposed to look at 1016. I had manually set all memory to 0 before I started, so I’m sure it was 0 before I started the program.
