$0292/658:   Index (in directory) for first available file

ROM-Reference:

 CPX $0292  : $C5FD
 LDA $0292  : $D73D $D7A2
 LDX $0292  : $C5F2
 STA $0292  : $C454 $C49F $C5F5 $D728 $D73A $ED94
 STX $0292  : $D70B

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