Routines
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B391: convert fixed integer AY to float FAC1
Used by the routines at AE86, AF28, AFE9 and B39E.
B391 A2 00 LDX #$00 set type = numeric
B393 86 0D STX $0D clear data type flag, $FF = string, $00 = numeric
B395 85 62 STA $62 save FAC1 mantissa 1
B397 84 63 STY $63 save FAC1 mantissa 2
B399 A2 90 LDX #$90 set exponent=2^16 (integer)
B39B 4C 44 BC JMP $BC44 set exp = X, clear FAC1 3 and 4, normalise and return
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