PDP-8 AC/MQ Bilnker

This program blinks the AC and MQ lights.

loop,  0000 2020 isz   delay  / create a delay
       0001 5000 jmp   loop
       0002 7200 cla          / clear AC so we can load it
       0003 1021 tad   value  / get value
       0004 7421 mql          / stash AC into MQ
       0005 1021 tad   value  / fetch value again
       0006 7040 cma          / complement AC
       0007 2021 isz   value  / get to next value
       0010 7000 nop          / ignore possible "skip" from ISZ
       0011 5000 jmp   loop   / and do it all again
delay, 0020
value, 0021