HP-41 Manual

Michael

unread,

Jun 10, 2011, 7:19:19 PM6/10/11

to

Dear group,

I have come across two short programs written for the HP-41. Could you
please give me a pointer as to where I can download/obtain a reference
manual for that model? I would like to understand the opcodes in the
listing and translate the program to a more modern version of RPL.

Thank you.

Regards,

PremiumBlend

unread,

Jun 10, 2011, 7:50:09 PM6/10/11

to

Hello Michael,

Take a look at http://www.hpmuseum.org/.

Regards,

Mark

Bart

unread,

Jun 11, 2011, 2:12:46 AM6/11/11

to

http://www.greendyk.nl/hp41c-manual/index.php

Michael

unread,

Jun 11, 2011, 6:12:13 AM6/11/11

to

Thank you!

Michael

unread,

Jun 11, 2011, 6:13:46 AM6/11/11

to

On Jun 11, 8:12 am, Bart <b...@barend.plus.com> wrote:

The online manual says that the function SIGN returns 1 to X if X is
zero. Is that true? It sounds counterintuitive, I would expect it to
return 0 for X=0, 1 for X>0 and -1 for X<0.

Michael

unread,

Jun 11, 2011, 8:10:16 AM6/11/11

to

Mark, thank you.
Could you please tell me with which keystrokes one would enter the
"x>0?" comparison on a hp-41?

Bart

unread,

Jun 11, 2011, 8:26:17 AM6/11/11

to

On Jun 11, 11:13 am, Michael <i...@noemanetz.de> wrote:

> The online manual says that the function SIGN returns 1 to X if X is
> zero. Is that true? It sounds counterintuitive, I would expect it to
> return 0 for X=0, 1 for X>0 and -1 for X<0.

0 is returned to X only if X is not a number. In the 41, HP has chosen
to group 0 with positive numbers, hence 1 is returned to X if X is
greater or equal to 0.

Regards

Michael

unread,

Jun 11, 2011, 9:47:35 AM6/11/11

to

Thanks. That is important to keep in mind for the 41.

Nate

unread,

Jun 11, 2011, 10:51:08 AM6/11/11

to

On Jun 10, 7:19 pm, Michael <i...@noemanetz.de> wrote:

http://www.hp41.org/Contents.cfm

Michael

unread,

Jun 11, 2011, 2:54:12 PM6/11/11

to

Thanks for the link. It's interesting to see the scans of the old
original pages. I came to that site in the hope it would explain how
to enter into a program the comparison "x>0?". The manual there says I
should turn around the calculator to find some instructions. Since I
don't own an original hp-41, but only an emulator software, I can't do
that. Do you know how to enter "x>0?"? Thanks!

Bart

unread,

Jun 11, 2011, 5:22:36 PM6/11/11

to

The back of the calculator shows the ALPHA keyboard, which nas another
set of shifted functions, amongst others the =, < & >.

see here:
http://www.greendyk.nl/hp41c-manual/layout/quick-back.htm

Regards

Message has been deleted

PremiumBlend

unread,

Jun 11, 2011, 5:32:11 PM6/11/11

to

Hello Michael,

Sorry, but I can't help you. I sold my HP-41CX in the early 90's and
I don't remember how to enter x>0?. Sometimes I would say
"Watch the birdie fly" after pressing the R/S key. I wonder how much
faster the bidie flies on the emulator. Anyway, happy programming!

Regards,

Mark

Michael

unread,

Jun 12, 2011, 2:27:04 AM6/12/11

to

Ah, that helps. Thanks!