$0297/663:   Active operating mode (R or W)

ROM-Reference:

 LDA $0297  : $D8A7 $D94A $D993
 LDX $0297  : $D96F
 STA $0297  : $D8C1
 STX $0297  : $D85A $D87F
 STY $0297  : $DA19

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