Routines
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BF71: perform SQR()
BF71 20 0C BC JSR $BC0C round and copy FAC1 to FAC2
BF74 A9 11 LDA #$11 set 0.5 pointer low address
BF76 A0 BF LDY #$BF set 0.5 pointer high address
BF78 20 A2 BB JSR $BBA2 unpack memory (AY) into FAC1
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