$6000/24576/WD+0:       Command- / Status Register

ROM-Reference:

 BIT $6000  : $CBEE $CBFA
 LDA $6000  : $C3EE $C402 $C416 $C429 $C439 $C449 $C459 $C469 $C479 $C48A
              $C49E $C4B2 $C4C5 $C4DB $C4FF $C511 $C52D $C667 $C741 $C841
              $C969 $CA69 $CD17 $CD43
 STA $6000  : $CBF5 $CFD4