Stack I-O and Machine Control Instructions
The following instructions affect the Stack and/or Stack Pointer:
PUSH Push Two bytes of Data onto the Stack POP Pop Two Bytes of Data off the Stack XTHL Exchange Top of Stack with H & L SPHL Move content of H & L to Stack Pointer
The I/0 instructions are as follows:
IN Initiate Input Operation OUT Initiate Output Operation
The Machine Control instructions are as follows:
EI Enable Interrupt System DI Disable Interrupt System HLT Halt NOP No Operation
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