instruction code
nop
The instruction code 'nop' is an instruction code of the heads_default and heads_sex instruction sets that does nothing or modifies the behavior of the instruction code preceeding it by changing the virtual CPU component that it affects (register or head), or acts as part of a template to denote positions in a digital organism's genome. A register name (AX, BX, or CX) surrounded by question marks refers to that register being used by default when the instruction code in question is being executed, but if the instruction code is followed by a 'nop' instruction code, the 'nop' instruction code will alter the register used. A head abbreviation (IP, RH, WH, or FH) surrounded by question marks refers to that head being used as a default, when the instruction code in question is being executed, but if the instruction code is followed by a 'nop' instruction code, the 'nop' instruction code will alter the head used.