Routines
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73E0: Message control code $0B: run the sub-message the signed byte that follows points at
MC_SUBMESSAGE 73E0 INC IX Step past the offset byte
73E2 PUSH IX HL = here plus the signed offset
73E4 POP HL
73E5 PUSH HL
73E6 LD E,(IX+$00)
73E9 LD D,$00
73EB BIT 7,E
73ED JR Z,MC_SUBMESSAGE_0
73EF LD D,$FF
MC_SUBMESSAGE_0 73F1 ADD HL,DE
73F2 CALL RUN_SUBMESSAGE Run that sub-message, then carry on with this one
73F5 POP IX
73F7 XOR A
73F8 RET
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