RTI        ReTurn from Interrupt
Category:  Interrupt control
Function:  SP <-- (SP) + 0001,  <-- CC
           SP <-- (SP) + 0001,  <-- ACCB
           SP <-- (SP) + 0001,  <-- ACCA
           SP <-- (SP) + 0001,  <-- IXH
           SP <-- (SP) + 0001,  <-- IXL
           SP <-- (SP) + 0001,  <-- PCH
           SP <-- (SP) + 0001,  <-- PCL

Effects on the Condition Codes
H = State returns as saved in stack
I = State returns as saved in stack
N = State returns as saved in stack
Z = State returns as saved in stack
V = State returns as saved in stack
C = State returns as saved in stack

ADDR    MNEM    OPER        1st     2nd     3rd
MODE    ONIC    FRMT        BYTE    BYTE    BYTE
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IMPL    RTI                 3B