$022B/555:   Logical index, channel 0

   Possible values:

        $FF = Inactive
        $81 = Opened for Writing
        $41 = ReaD/Write
        $01 = Opened for Reading

ROM-Reference:

 LDA $022B,X: $CBF3 $D0FB $D110 $D230 $D319 $DB04 $DDBB $E672 $EC14
 LDA $022B,Y: $DC6C $DCFF
 STA $022B,X: $CBF8 $D1F5 $D23D $DA51 $EB76
 STA $022B,Y: $DC71 $DD06

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