$EF4D/61261:   Get number of free blocks for dir

Jump from $C814, $E33B:

EF4D: A6 7F     LDX $7F         ; drive number
EF4F: BD FA 02  LDA $02FA,X     ; number of blocks, lo
EF52: 8D 72 02  STA $0272
EF55: BD FC 02  LDA $02FC,X     ; number of blocks, hi
EF58: 8D 73 02  STA $0273       ; in buffer for directory
EF5B: 60        RTS

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