$57-$5B/87-91:   Temporary storage for FLPT value

Kernal-Reference:

 LDA $57,X   : $A417

 ADC $58     : $B2B2 $B33F $B58D
 CMP $58     : $B5B4
 LDA $58     : $A3DC $B160 $B56E $B62E
 STA $58     : $A3E0 $A4FF $B159 $B1A0 $B566 $B58F $B624
     ($58),Y : $A3EA $A3F1 $B2C9

 ADC $59     : $B2AA $B344 $B594
 CPX $59     : $B5B0
 DEC $59     : $A3E4 $A3F5 $B2CD
 INC $59     : $B2D3 $B633
 LDA $59     : $B635
 LDX $59     : $B570
 LDY $59     : $B162
 STA $59     : $B2AE $B596
 STX $59     : $B568 $B626
 STY $59     : $A508 $B15B $B1A2

 LDA $5A     : $A3C0 $A3D0
     ($5A),Y : $A3E8 $A3EF
 STA $5A     : $A3D5 $A4FB $B14F $B618

 DEC $5B     : $A3D9 $A3F3
 LDA $5B     : $A3C7
 STA $5B     : $B61E
 STY $5B     : $A503 $B151

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