$61-$66/97-102:   Main Floating point Accumulator
 $61/97:   FAC Exponent

Kernal-Reference:

 ADC $61     : $BABC
 CPX $61     : $BC6D
 INC $61     : $B938 $BAF4 $BB21
 LDA $61     : $A937 $AE52 $AE80 $B1BF $B4D5 $B7FB $B85D $B9F4 $BAB4 $BBF5
               $BC1B $BC2B $BC9B $BCCC $BFB4 $E005 $E0E7 $E316
 LDX $61     : $B052 $BD8C $BDF1
 LDY $61,X   : $E020
 SBC $61     : $B04A $B87B $B92C $BB1A
 STA $61     : $B037 $B484 $B8F9 $B934 $B9FB $BAC8 $BB1C $BBC2 $BCE0 $E0ED
     $61,X   : $A422 $E022
 STX $61     : $BC4F
 STY $61     : $A9E9 $B4A9 $B881

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