Routines
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BC1B: round FAC1
Used by the routines at A9A5, AE43, BB0F, BBD4 and BC0C.
BC1B A5 61 LDA $61 get FAC1 exponent
BC1D F0 FB BEQ $BC1A exit if zero
BC1F 06 70 ASL $70 shift FAC1 rounding byte
BC21 90 F7 BCC $BC1A exit if no overflow
This entry point is used by the routine at BFED.
round FAC1 (no check)
BC23 20 6F B9 JSR $B96F increment FAC1 mantissa
BC26 D0 F2 BNE $BC1A branch if no overflow
BC28 4C 38 B9 JMP $B938 nornalise FAC1 for C=1 and return
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