Work out a loan payment on the keypad
Time value of money in Vintage's Financial mode.
For $250,000 over 30 years at 6.5%:
360 n · 6.5 g i · 250000 PV · 0 FV · PMT
PMT shows −1,580.17, negative because it’s money you pay.
To try another rate, type it and press g i, then PMT again; the other registers are still there. Start a new problem with g CLx, which clears n, i, PV, PMT, FV and the cash flows.