I tried my old TVM equation in Thomas Okken's Free42 (decimal version) and was surprised it's now more accurate than my real HP42S.

Example 1:

n=63

i=0.00000161

PV=0

PMT=-1,000,000

END Mode (set B/E=0 in Solver)

Solving for FV:

HP 42S: 63,000,031.4434

Free42: 63,000,031.4433

(correct is 63,000,031.4433)

Example 2:

n=31536000

i=10/n

PV=0

PMT=-0.01

END Mode

Solving for FV:

HP 42S: 331,667.006689

Free42: 331,667.006691

(correct is 331,667.006691)

The TVM Solver can be found here:

TVM Solver for HP42S