HP 10BII Owner's Manual page 68

Annual nominal interest rate.
Starting balance.
[33] Ending balance.
Payment amount (rounded to the display format).
Number of payments per year.
To Amortize. To amortize a single payment, enter the period number
and press С). The HP 10BII displays the annunciator PER followed
by the starting and ending payments that will be amortized.
and ending periods.
Example: Amortizing a Range of Payments. Calculate the first two
years of the annual amortization schedule for a 30 year, $180,000
mortgage, at 7.75% annual interest with monthly payments.
68 5:Time Value of Money Calculations