$12-$13/18-19:   Disk ID, drive 0

ROM-Reference:

 LDA $12,X  : $EE78 $F514 $FC59
 LDA $12,Y  : $F3F6
 STA $12    : $F412
 STA $12,X  : $D057 $EE2F

 LDA $13,X  : $EE7D $F518 $FC53
 LDA $13,Y  : $F3FD
 STA $13    : $F416
 STA $13,X  : $D05B $EE34

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