$02FC-$02FD/764-765:   Number of free blocks, hi byte (drives 0 and 1)

ROM-Reference:

 DEC $02FC,X: $EFB7
 EOR $02FC,Y: $FC71
 INC $02FC,X: $EF84
 LDA $02FC,X: $EF55 $EFBD
 STA $02FC,X: $D093

 EOR $02FD,Y: $FC74

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