$02A9-$02AA/681-682:  Anzahl freie Blocks

ROM-Reference:

 ADC $02A9  : $8FA6
 DEC $02A9  : $B59D
 INC $02A9  : $B569
 LDA $02A9  : $B595 $B5A5 $B65B $B814
 STA $02A9  : $8FA9 $B4F1 $B83A $B846
 STX $02A9  : $8F8A $8FCB

 DEC $02AA  : $B59A
 INC $02AA  : $8FAE $B56E
 LDA $02AA  : $B5A0 $B661 $B818
 STA $02AA  : $B836 $B842
 STX $02AA  : $8F8D $8FCE

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