characters not equal, update System Set interval timer Enable external interrupts Disable external interrupts Scan in – initiate IO read, this changed on different architectures Scan out – initiate IO write, this changed on different architectures Set tag (not allowed in user-level processes) Read tag Hardware pseudo operator Set processor register (highly implementation dependent, only used in lower levels of MCP) Read processor register (highly implementation dependent, only used in lower levels of MCP) Make PCW Halt the processor (operator requested or some unrecoverable condition has occurred) Other Escape to extended (variable instructions which were less frequent) Occurs index builds an occurs index word used in loops Linked list lookup – Follow a chain of linked words until a certain condition is met Masked search for equal – Similar to LLLU, but testing a mask in the examined words for an equal value Table enter edit destructive Table enter edit, update Execute single micro destructive Execute single micro update Execute single micro, single pointer update No operation Invalid operator (hex code FF) User operators unassigned operators could cause interrupts into the operating system so that algorithms could be written to provide the required functionality Edit operators These were special operators for sophisticated string manipulation, particularly for business applications. Move with insert – insert characters in a string Move with float Skip forward source character Skip reverse source characters Reset float End float Move numeric unconditional Move characters Insert overpunch Insert sign Skip forward destination character Skip reverse destination characters Insert unconditional Insert conditional End edit Notes References Instruction processing Instruction set architectures Instruction set listings