What is it with Texas BAs and failing at key rollover???

The (real, physical) Texas BA is fairly well designed on the whole but has a huge design flaw.

Basically they utterly failed to implement 2-key rollover in the way that any other calculator does.

Try it with a real one: hold down a key (say 3), keep it down and release another (say 4), now release 3, and then release 4. The BA completely ignores the 4 key!

This situation happens all the time when entering numbers quickly with 2 fingers. People are often confused as to why the calculator missed digits.

So onto this iPhone software version- the engineers fixed the case I described above, but incredibly they left the following bug!

Try pressing and holding 3, then press and release 4, then release 3. Amazingly the software BA has registered 43!

This calculator is only useful to me for helping out students who like to use it for TVM calculations, I would never use it myself unless I had to.

a1and about BA II Plus™ Financial Calc, v1.1