I'm writing a program to find TI-BASIC (z80) expressions that map certain inputs to certain outputs, but am running into numerical instability issues.

I know TI-OS has 14 digit floats; are there existing decimal floating-point libraries with a 14-digit significand that exactly replicate the behavior of the TI routines? If not, can I use decimal64 and round the result to 14 digits?
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