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RTI: /R-T-I/ interj. The mnemonic for the `return from
   interrupt' instruction on many computers including the 6502 and
   6800.  The variant `RETI' is found among former Z80 hackers
   (almost nobody programs these things in assembler anymore).
   Equivalent to "Now, where was I?" or used to end a
   conversational digression.  See pop; see also POPJ.