$7F/127:   Drive number (on 1541 always 00)

ROM-Reference:

 CMP $7F    : $D32D
 INC $7F    : $EC5C
 LDA $7F    : $C107 $C1AD $C38F $C4EC $C8DA $CBEA $D2A7 $D5C8 $D5ED $D6DF
              $D7AF $D80E $D9FC $DAB2 $DE86 $EC45 $ECB7 $EE20 $EF0F $F060
              $F0D1
 LDX $7F    : $C641 $C65F $C669 $C7C4 $D04B $D06A $D091 $EE49 $EE6D $EF4D
              $EF88 $F017 $F040 $F111
 LDY $7F    : $D695 $EEFF
 ORA $7F    : $C56E $D466 $D58C $D63A $D64D $D661 $D7E9 $DC3B $DC53 $DCEF
              $DF2D
 STA $7F    : $C14E $C38A $C395 $C402 $C944 $C9AE $CA01 $CAA3 $CB87 $CDFC
              $D1DC $D5D0 $D66E $D6FF $D7D4 $D823 $D9E7 $DBBC $DF2A $E22C
              $EC4B $EC6F $EE1B $EEFD

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