$3E/62:   Active drive (FF, if not active)

ROM-Reference:

 CMP $3E    : $F2DB $F443
 LDA $3E    : $F3F2
 LDX $3E    : $F3E6 $F98F $F9CB
 STA $3E    : $F290 $F2E4 $F9F2

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