$70/112:   FAC low-order rounding

Kernal-Reference:

 ASL $70     : $B91F $BC1F
 CMP $70     : $BC8A
 INC $70     : $B96B
 LDA $70     : $B4B7 $B89C $B965 $B9A2 $BA3D $BFF4
 LDX $70     : $B4B0 $B86F $B8EB
 LDY $70     : $B4C5 $B66F
 ROR $70     : $B944 $BA85
 STA $70     : $AF39 $B64D $B8B4 $B900 $B969 $BB84 $BC51 $E02B $E0E9
 STX $70     : $BC09 $BC18
 STY $70     : $AA5F $B48F $B4E7 $B895 $B8EF $B987 $BBC4 $BBF9 $BCD5

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