System
SINT — Set interval timer
EEXI — Enable external interrupts
DEXI — Disable external interrupts
SCNI — Scan in – initiate IO read, this changed on different architectures
SCNO — Scan out – initiate IO write, this changed on different architectures
STAG — Set tag (not allowed in user-level processes)
RTAG — Read tag
IRWL — Hardware pseudo operator
SPRR — Set processor register (highly implementation dependent, only used in lower levels of MCP)
RPRR — Read processor register (highly implementation dependent, only used in lower levels of MCP)
MPCW — Make PCW
HALT — Halt the processor (operator requested or some unrecoverable condition has occurred)
Read more about this topic: Burroughs Large Systems Instruction Sets
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