New HP 15c CE speed tests

[J-F Garnier]

(05-03-2023 01:57 PM)Gene Wrote:  ...the CE is 186 X faster than the original 15C and perhaps 5-10% faster than the 15c LE (hard to know if the 28 seconds has any rounding in it).

The new manual is very conservative when it states:

Quote:typical operations are 10–20 times faster than on the HP-15C.

However, the manual then gives more details and clarifications:

Quote:To minimize power consumption, the calculator normally operates in a
low-power mode, with the processor running at a slow speed. When
running user programs (including integration), the calculator switches the
processor to full speed, which increases the demand on the batteries.
However, when the low battery indicator comes on, the calculator will
only run at the slow speed to avoid overloading the batteries

So we can assume the 10x-20x ratio is in slow speed mode.

One of the longest keyboard operations is the calculation of Cy,x combinations.
320 ENTER 160 Cy,x gives 9.5197e94 on my original 15C in about 35s.
On my 15c LE, it takes less than one second.

Another direct keyboard operation test:
8   ENTER   DIM A     ; dim a(8,8)
PI   STO MATRIX A    ; mat a=(pi)
RCL MATRIX A   1/x    ; mat a=inv(a)
Matrix is singular, but the 15c will calculate something anyway

Original 15C: about 60 s
My 15c LE: < 1s

What about the 15c CE ?

J-F