Stack Operators
PUSH — Push down stack register
DLET — Pop top of stack
EXCH — Exchange top two words of stack
RSUP — Rotate stack up (top three words)
RSDN — Rotate stack down (top three words)
DUPL — Duplicate top of stack
MKST —Mark stack (build a new stack frame resulting in an MSCW on the top,
— followed by NAMC to load the PCW, then parameter pushes as needed, then ENTR)
IMKS — Insert an MSCW in the B register.
VALC — Fetch a value onto the stack as described above
NAMC — Place an address couple (IRW stack address) onto the stack as described above
STFF — Convert an IRW as placed by NAMC into an SIRW which references data in another stack.
MVST — Move to stack (process switch only done in one place in the MCP)
Read more about this topic: Burroughs Large Systems Instruction Sets
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