$0256/598:   Bitmap of free channels

   Bit = 1: Channel free
   Bit = 0: Channel used

ROM-Reference:

 AND $0256  : $D393
 BIT $0256  : $D383
 ORA $0256  : $D253
 STA $0256  : $C901 $D256 $D396 $EBA1

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