$69-$6E/105-110:   Auxiliary Floating point Accumulator
 $69/105:   AFAC Exponent

Kernal-Reference:

 LDA $69     : $B875 $BAB7 $BF7D
     $69,X   : $E01E
 STA $69     : $AE6B $BAB2
 STY $69,X   : $E024

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