ASM_FMT_M18
op = ASM_OP_SETF_SIG, fmt = ASM_FMT_M18;
op = ASM_OP_SETF_EXP, fmt = ASM_FMT_M18;
op = ASM_OP_SETF_S, fmt = ASM_FMT_M18;
op = ASM_OP_SETF_D, fmt = ASM_FMT_M18;
case ASM_FMT_M18: