$3F/63:   Buffer number for disk controller

   Previous work place in queue (0 - 5)

ROM-Reference:

 DEC $3F    : $F306 $F483
 LDA $3F    : $F335 $F36E $F475
 LDY $3F    : $F393 $F5DC $F969
 STX $3F    : $F436 $F48D
 STY $3F    : $F2D1 $F2FF

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