FDISP Key & Fractions on 41cx

[Sylvain Cote]

Without doing any research, I do not remember an mcode function that would do that on the HP-41.
The "standard" way would be to use ALPHA mode to enter/display the fraction value and use the stack to enter/display the numerical values.

I do not know if it helps, the following programs are part of the PPC ROM:

• DF : Decimal to Fraction : PPC ROM Manual, p.124 : This routine will convert a decimal to a fraction which approximates the decimal.
• FR : Fractions : PPC ROM Manual, p.170 : This program has routines for addition, subtraction, multiplication, division, and reduction of fractions. Setting a flag (10) allows fractional to be displayed in the alpha register.