Question

This is a PDP-8 Program. Kindly can any one disassemble it.

Binary representation   Octal Representation
111000000001            7001
010000011100            2034
101000010001            5021
101000010000            5020

I want to know what the heck this code is doing.

PS: This is not a homework. I just found this code in a video. There is no explanation about it.

Answer 1

7001         IAC      Increment the accumulator 
2034         ISZ 24 Increment location 0024, skip next instruction if zero 
5021         JMP .-1  Jump back one place 
5020         JMP .-3  Jump back to beginning

Source, about halfway down the page is this exact program.

All this program does is add one to
the accumulator, then it counts from 0
up to 4096, then it adds another one
to the accumulator and so on … The
adding up to 4096 is sufficient delay
so that the higher order accumulator
lights can be seen to be switching on
and off rather than just flickering
rapidly.