$B947/47431:   2's Complement FAC#1

Jump from $B8D4:

B947: A5 66     LDA $66       ; FAC Sign
B949: 49 FF     EOR #$FF
B94B: 85 66     STA $66       ; FAC Sign

Jump from $BCAB:

B94D: A5 62     LDA $62       ; FAC Mantissa
B94F: 49 FF     EOR #$FF
B951: 85 62     STA $62       ; FAC Mantissa
B953: A5 63     LDA $63       ; FAC Mantissa
B955: 49 FF     EOR #$FF
B957: 85 63     STA $63       ; FAC Mantissa
B959: A5 64     LDA $64       ; FAC Mantissa
B95B: 49 FF     EOR #$FF
B95D: 85 64     STA $64       ; FAC Mantissa
B95F: A5 65     LDA $65       ; FAC Mantissa
B961: 49 FF     EOR #$FF
B963: 85 65     STA $65       ; FAC Mantissa
B965: A5 70     LDA $70       ; FAC low-order rounding
B967: 49 FF     EOR #$FF
B969: 85 70     STA $70       ; FAC low-order rounding
B96B: E6 70     INC $70       ; FAC low-order rounding
B96D: D0 0E     BNE $B97D

Jump from $BC23:

B96F: E6 65     INC $65       ; FAC Mantissa
B971: D0 0A     BNE $B97D
B973: E6 64     INC $64       ; FAC Mantissa
B975: D0 06     BNE $B97D
B977: E6 63     INC $63       ; FAC Mantissa
B979: D0 02     BNE $B97D
B97B: E6 62     INC $62       ; FAC Mantissa

Jump from $B96D, $B971, $B975, $B979:

B97D: 60        RTS

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