Routines
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BBFC: copy FAC2 to FAC1
Used by the routines at AFE9 and B86A.
BBFC A5 6E LDA $6E get FAC2 sign (b7)
This entry point is used by the routine at BF7B.
save FAC1 sign and copy ABS(FAC2) to FAC1
BBFE 85 66 STA $66 save FAC1 sign (b7)
BC00 A2 05 LDX #$05 5 bytes to copy
BC02 B5 68 LDA $68,X get byte from FAC2,X
BC04 95 60 STA $60,X save byte at FAC1,X
BC06 CA DEX decrement count
BC07 D0 F9 BNE $BC02 loop if not all done
BC09 86 70 STX $70 clear FAC1 rounding byte
BC0B 60 RTS
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