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Appendix G
Differences Between the
HP 15c CE and HP-15C
Performance
The CPU of the HP 15c CE is more than 200 times faster than the CPU in
the original HP-15C. Due to overhead, real-world performance does not
increase by this much, but typical operations are 10–20 times faster than
on the HP-15C.
If a program written for the original HP-15C relies on special timing, for
example if the expected run-time of a program gives the user a fixed time
to react, then that program will need to be slowed down on the HP 15c CE,
possibly by the addition of © (pause) steps or by making loops repeat
more times.
Memory
The HP 15c CE provides 50% more memory than the HP-15C—672 bytes
instead of 448 bytes. This increases the number of allocatable storage
registers from 64 to 96.
This means the | W function, which displays the available registers
and their allocation, will appear different due to the increased memory on
the HP 15c CE. The default allocation shows “19 78 00-0” instead of
“19 46 0-0”.
The original HP-15C was limited by memory to a maximum matrix size of
8 × 8. Despite the increased memory of the HP 15c CE, the limit of 8 × 8
remains for matrix inverse, determinant, and division.
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