$02FA-$02FB/762-763:   Number of free blocks, low byte (drives 0 and 1)

ROM-Reference:

 DEC $02FA,X: $EFBA
 EOR $02FA,Y: $FC6B
 INC $02FA,X: $EF7F
 LDA $02FA,X: $EF4F $EFB2 $EFC2
 STA $02FA,X: $D097

 EOR $02FB,Y: $FC6E

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