$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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