What is the PDP-8 instruction set?: "The basic instructions are:
000 - AND - and operand with AC.
001 - TAD - add operand to (a 13 bit value).
010 - ISZ - increment operand and skip if result is zero.
011 - DCA - deposit AC in memory and clear AC.
100 - JMS - jump to subroutine.
101 - JMP - jump.
110 - IOT - input/output transfer.
111 - OPR - microcoded operations."
