Complex Square Root on 33s

[Bill P]

On comp.sys.hp48 lately, several people have been complaining about the absence of a direct complex square root function on the HP 33s. Here is my solution:

G0001 LBL G

G0002 0

G0003 0.5

G0004 CMPLXy^x

G0005 RTN

This puts the complex square root on the calc as an effective extra command for the SQRT(x) key. This may be useful if the command is needed often.

[René Stäbler]

I'm an old 41cv user and used to an excellent key-pad - has anyone already experienced the type / feeling of the 33s keys? thanks in advance, rene

[V-PN]

33s key feedback is better than in my 42S and 32SII. I like it. 

Coloring or the general shape is another issue. 48G colors are worse IMO

{VPN} AXL

[Karl Schneider]

Bill --

In fact, I was just reviewing this today. Your program is the logical work-around.

I believe that the complex-number capability of the 33S (and of its ancestral 32SII/32S models) was based upon the routines provided in the HP-41C Math Pac. This ROM also lacked direct complex-argument support for x^2, sqrt, hyperbolics, and inverse trigs. "Z^N", "Z^1/N", and "Z^W" could be used for the first two, but the others would require a bit of work.

Among the RPN models, only the 15C and 42S have complete complex-number support.

[Ángel Martin]

A small correction: now also the 41 has a full support of complex functions, and even more complete than those mentioned (15C and 42S).

See the HP-41Z ROM available on the web's other site. Just a few days ago I uploaded the last revision, with source code available as well.

Best,
ÁM.