$0100/256:   Flag: Drive 1 not ready

   $FF = Not Ready (No disk), $00 = Ready

ROM-Reference:

 CMP $0100,Y: $FD6D
 LDA $0100,X: $F685 $FCEE
 LDA $0100,Y: $F5B3 $F6A5
 STA $0100,Y: $F4E7

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