HP-35 x^y key


Hi, just a curiosity...

In the HP-35 calculator page (the first pocket calculator), I read it had a x^y key instead of the modern y^x; my question is perhaps silly, but I have not a HP-35 to play with, so if one of you can explain me...

to get, say 2^5 on my HP-12C I type 2 ENTER 5 y^x; what have I to type on a HP-35 to perform the same operation? I believe that, according to the x^y symbols, I should type 5 ENTER 2 x^y: is it correct?


-- Antonio


Oh yes Antonio, this is correct on every HP-35, with red-dot or without.

Regards from Sardinia.




The 35 does not have a 10^x key either so the x^y helped there.
I still much prefer the 45 to the 35.



Hi, Antonio --

The topic of the x^y key on the old HP-35 came up several years ago, but I didn't bookmark the thread. It's possible that "x raised to the y" with y residing above x in the stack was the rationale for the convention. However, I believe that the real reason for x^y instead of y^x is absence of a 10^x key, as Arnaud mentioned. 10 x^y will easily compute the antilogarithm of a result.

Especially when "-" computes y-x and "/" computes y/x, y^x is the natural definition.

-- KS

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-35 blind buy but buggy! Max Stone 7 2,074 11-11-2013, 05:56 PM
Last Post: Dieter
  Another HP 35 Red Dot on eBay Michael de Estrada 5 1,688 11-09-2013, 03:07 PM
Last Post: aj04062
  HP Prime - EEX/X/Toolbox-key suggestions bluesun08 2 1,020 11-07-2013, 06:15 PM
Last Post: bluesun08
  HP PRIME : strange behavior when trying user key capability Damien 12 2,663 11-03-2013, 11:02 AM
Last Post: Joe Horn
  HP PRIME: How to use [a b/c] key from a program Joseph Ec 4 1,321 10-29-2013, 06:18 PM
Last Post: Joseph Ec
  Roll-down key in HP-15C Steve Ross 6 1,491 10-15-2013, 04:12 AM
Last Post: Nick_S
  HP 35 ... 80 Olivier De Smet 6 1,652 08-29-2013, 07:25 AM
Last Post: Olivier De Smet
  HP-15 LE Key repair question Namir 2 1,019 06-10-2013, 10:42 PM
Last Post: Namir
  HP 35 Pretty Good Purchase Today! Norman Dziedzic 1 965 03-05-2013, 12:52 AM
Last Post: Dan Lewis
  Slightly OT: Remember the extraction of the HP-35 ROM? Frank Boehm (Germany) 1 774 02-06-2013, 05:53 PM
Last Post: aurelio

Forum Jump: