instruction code Inst-Write The instruction code 'Inst-Write' is an instruction code of the transsmt instruction set that pops the instruction code on the ?A? stack and writes it into the memory location pointed to by the write-head ?WH?, and and advances the write-head ?WH? by one position. This instruction code can be modified by one or two 'Nop' instruction codes. The first 'Nop' instruction code specifies which head (read-head, write-head, flow-head, or instruction pointer) is used, and the second 'Nop' instruction code specifies from which stack the instruction is read.