1. Use a leading dash (-) to input a negative value and a period (.) to separate the integer and fraction amounts. I process only the first six characters of the fraction part.
2. The "User-1" and "User-2" fields need you to specify characters to use for their "digit" values. The first character should be the equivalent of zero, the second is the base value, and each succeeding character is the next higher power of the base.
3. The dash (-) and period (.) are valid ASCII characters, so they can not be used for negative and fractional input.
4. Roman Numeral lower-case letters have values 1000 times their upper-case versions. For Roman Numeral fraction values, the first character is the denominator and the rest give the value of the numerator.