$FE18/65048:   Control OS Messages

Jump from $FF90:

FE18: 85 9D     STA $9D

Jump from $FE0B:

FE1A: A5 90     LDA $90

Jump from $EDB2, $EE4F, $F18A, $F518, $FA81, $FAC6, $FB35, $FB88:

FE1C: 05 90     ORA $90
FE1E: 85 90     STA $90
FE20: 60        RTS

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