$B9/185:   Current File - Secondary Address

Kernal-Reference:

 BIT $B9     : $F642
 LDA $B9     : $F23B $F27D $F2C8 $F2E0 $F369 $F393 $F3D5 $F3E6 $F4D0 $F579
               $F610 $F64B $F66E $F681
 LDX $B9     : $F22A $F26F $F4BF
 LDY $B9     : $F3C4
 STA $B9     : $F32C $F36D $F4C6 $F5FC
 STY $B9     : $FE04

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