$13/19:   File number of current Input Device

Kernal-Reference:

 BIT $13     : $AADC
 LDA $13     : $AAD3 $AB3B $AB62 $ABB5 $ABD9 $ABEF $ABF9 $AC43 $ACF0
 LDX $13     : $ABA0
 STA $13     : $A44C $E380 $E3F2
 STX $13     : $AA91 $AB8D $ABAD $ABBC

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