HP 10bii Calculator
This is a reproduction of the HP 10bii
Our design goal was to give users a clean 10bii that they could feel
comfortable with immediately without the awkward additions found on
other iOS implementations of this HP classic. Since CALC 1 contains so
many tools for calculations, we did not need to add anything to the
10bii reproduction. We share the stack, TVM values and some storage
registers so the user can switch between the 10bii and the many CALC 1
tools.
The examples and instructions in the HP manual will apply to this
reproduction with these differences / enhancements:
- The PEND indicator is not used since the parenthesis, math operators
and right hand value are displayed.
- Text instead of graphics is used for the key labels to take
advantage of iOS
Dynamic Type. This allows the user to adjust the text size for
this calculator. You can also adjust the button text size in options.
- An easy to read font was used instead of a 7 segment LED style font
for legibility and Dynamic type. This also allows error messages
instead of error codes.
- CALC 1 uses
double precision floating point format for calculations for a
maximum of 1e+308.
- The ON key from the hardware calculator is not needed so it is a
BACK key on standard iPhones to exit the calculator. On plus size
iPhones this is used to toggle between a full and compact view in
landscape.
How the 10bii fits in with CALC 1
Shared values
- The stack (x, y, z and t values and last x)
- TVM values: N, i (rate), PV, PMT FV and BEG/END mode.
- Storage registers 0 to 9. CALC 1 uses variables a-z instead of
numbered storage and the 10bii 0 to 9 storage registered are copied to
the variables used with keys 0-9.
Sharing values allows you to use the 10bii to calculate a payment, then
switch to the
Amortization Form Calculator to generate a amortization table or
graph without re-entering the values. This is just one example of the
many tools available in CALC 1.
Shared Options
- The calculation
mode on the 10bii is the CHN (chain)
mode on CALC 1. When you exit the 10bii, the calculation mode will be
CHN in the CALC 1 options.
- The number of digits are shared. If set to more than 9 in CALC 1 it
will be reduced to 9 in the 10bii.
- The CALC 1 “use significant digits” options is turned off for the
10bii.
- Key Clicks and Haptic Feedback
can be set in the CALC 1 options.
The CALC 1 options are read when the 10bii loads. So changes to the CALC
1 Options page while the 10bii is loaded (only on an iPad) will
not be seen by the 10bii until it is loaded. Changes from the 10bii
options (number of digits) will be copied from the 10bii to the CALC 1
settings when the 10bii is unloaded.
This calculator uses the first formula in Time
Value of Money Compound Interest Formulas.