|HP-17bII+ emulator problem (TW?)|
Message #1 Posted by fhub on 23 June 2013, 8:31 a.m.
I don't know who is responsible for the 17bII+ emulator, maybe Tim Wessman?
There's a bug when calculating the interest rate I%YR in TVM mode:
The I%YR calculation doesn't work if executed with the mouse (on the I%YR menu button! It displays "CALCULATING..." for a fraction of a second and then immediately "INTERRUPTED".
You can try it with following example:
N=10, PV=1000, PMT=100, FV=-2200 and then click on [I%YR]
It only works with the mouse if I%YR already has the correct value, i.e. if you've previously entered I%YR, calculated any other TVM-value and the re-calculate I%YR again. But after changing any other value, this "INTERRUPTED" problem happens again when clicking on I%YR.
(BTW, the I%YR calculation with the function key <F2> works without problems)
My guess is that the I%YR routine continuously checks if you click on any button (with the mouse) to interrupt the iteration, and this check is done so early that the previous mouseclick (on the I%YR button for starting the calculation) is immediately interpreted as 'interruption'!?
If HP should ever think about releasing a new version of this 17bII+ emulator, maybe this bug could be fixed ... ;-)