$B850/47184:   Perform Subtraction

Jump from $BA0F, $E288, $E334:

B850: 20 8C BA  JSR $BA8C     ; Load FAC#2 From Memory

Jump from $E02D, $E281:

B853: A5 66     LDA $66       ; FAC Sign
B855: 49 FF     EOR #$FF
B857: 85 66     STA $66       ; FAC Sign
B859: 45 6E     EOR $6E       ; AFAC Sign
B85B: 85 6F     STA $6F       ; Sign of result of Arithmetic Evaluation
B85D: A5 61     LDA $61       ; FAC Exponent
B85F: 4C 6A B8  JMP $B86A     ; Perform Addition

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