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55574: Interrupt routine: Restore all registers from the stack
Used by the routines at 54853, 55461 and 55478.
55574 POP HL Restore registers HL, IY & IX (HL has address of call to this routine, i.e. 55574)...
55575 POP IY ...
55577 POP IX ...
55579 EX AF,AF' Restore shadow registers too...
55580 EXX ...
55581 POP AF ...
55582 POP BC ...
55583 POP DE ...
55584 POP HL ...
55585 EX AF,AF' ...
55586 EXX ...
55587 POP AF Restore AF, BC, DE...
55588 POP BC ...
55589 POP DE ...
55590 EX (SP),HL Put HL (address of call to 55574) back on stack in preparation for RET and take off original value of HL
55591 RET Return
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