Differences between the HP 15c CE and the original HP-15C

[Valentin Albillo]

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Hi, Gene & all, (my highlighting)

(06-12-2023 06:00 PM)Gene Wrote:  This list is not "my" list. Much of it is in the actual HP-15C CE manual itself and several people here helped with reviewing the write-up of this list.

I assumed that much but see below.

Quote:And FYI - one of the longer running programs for the HP-15C, Valentin's e to 208 places, takes about 20.5 seconds with the PSE instruction removed on the HP-15C CE.

Thanks for mentioning my HP-15C Multiprecision e program featured in my PDF article Long Live the HP-15C, much appreciated.

In the article, I mention that it takes my program 62 min. 43 sec. to compute e to 208 digits on a vintage HP-15C, but that timing includes the execution of 124 PSE (Pause) instructions specifically included for the user to see steady progress instead of staring at a blinking "running" display for an hour.

If we subtract those ~124" from the total 62' 43" we get 60' 39" = 3,639". But you then say that the new HP-15C CE takes just 20.5", which means it runs my program about 178x faster, which is inconsistent with your OP statement that says, I quote:

"The CPU of the HP 15c CE is more than 200 times faster than the CPU in the original HP-15C. [...] but typical operations are 10–20 times faster than on the HP-15C."

So, which is it ? More like 10-20x faster or more like ~178x faster ? I sure hope it's the latter value, else the faulty Limited Edition would be much faster, at 90-100x.

Last but not least, the available 672 bytes vs. the original 448 bytes means that my program (with a one-step change) would now be able to compute almost ~300 digits of e on the new CE instead of just about~200 digits.

Thanks and regards.
V.