Does the new 15c ce utilise IEEE754 floats?

[Werner]

(11-09-2023 07:08 PM)Commie Wrote:  Hi Gents,

I have just received my brand new hp15c ce yesterday and I have been getting acquainted with it. My question is, does the 15c ce use IEEE754 floating point format or bcd floating point.? I think the original hp15c calculators would have used bcd floating point and for good reason.

The 15CE uses essentially the same ROM as the original 15C, with a few bugs fixed, but running on new hardware, many times faster. All algorithms and number formats etc are the same.

Quote:With my hp15c ce sin(x) pi gives a small number instead of zero, a tell tale sign of IEEE754 float usage.

As has been explained many times before, Pi cannot be represented exactly in finite floating-point (be it BCD or IEEE), and so the Pi button gives you the 10-digit approximation of Pi. Its sine is NOT zero.

Cheers, Werner