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HP Forum Archive 16

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41CV
Message #1 Posted by Pat on 6 Nov 2006, 2:23 p.m.

How do I get my 41CV out of radian mode?

      
Re: 41CV
Message #2 Posted by Chiu Yiu Wai on 6 Nov 2006, 2:33 p.m.,
in response to message #1 by Pat

XEQ DEG Degree mode XEQ RAD Radian mode XEQ Grad Grade mode

in degree mode display will not show DEG in radian and grade mode will show RAD and GRAD on display

            
Re: 41CV
Message #3 Posted by Pat on 6 Nov 2006, 3:10 p.m.,
in response to message #2 by Chiu Yiu Wai

My 41CV does not have XEQ or DEG on the keyboard. Are there other keystrokes to simulate these?

                  
Re: 41CV
Message #4 Posted by Raymond Del Tondo on 6 Nov 2006, 3:31 p.m.,
in response to message #3 by Pat

The XEQ key is directly beneath the YELLOW shift key,
and above the BIG ENTER key.
On a normal HP-41, you just can't miss it;-)
Or are the non-numeric keys blank?
If yes, it may be a so-called 'blanknut'.

If you have an HP-41 manual aside,
please take a look inside on how to use XEQ,
AFAIK there's a brief description...

                        
Re: 41CV
Message #5 Posted by Pat on 6 Nov 2006, 4:08 p.m.,
in response to message #4 by Raymond Del Tondo

Thanks. I did miss it! No manual though. Any suggestions for the keys for degrees?

                              
Re: 41CV
Message #6 Posted by Monte Dalrymple on 6 Nov 2006, 4:18 p.m.,
in response to message #5 by Pat

XEQ, ALPHA, D, E, G, ALPHA, where the "D, E, and G" are the keys labelled with those lettered in blue. There are lots of functions in the 41CV that aren't normally available directly from the keyboard, but must be XEQed by name.

                                    
Re: 41CV
Message #7 Posted by Pat on 6 Nov 2006, 5:20 p.m.,
in response to message #6 by Monte Dalrymple

Thanks for the specific help and additional info.

      
HP-41 angular modes & system flags
Message #8 Posted by Karl Schneider on 6 Nov 2006, 10:28 p.m.,
in response to message #1 by Pat

Quote:
How do I get my 41CV out of radian mode?

Monte Dalrymple provided the answer in this lengthy thread to a very simple question, but I'll add a bit more. The angular mode is represented by the status of two flags (0 = clear; 1 = set):

          Alpha Code    Flag 42   Flag 43
Degree       DEG          0          0
Radian       RAD          0          1
Grad         GRAD         1          0

The user can check the angular mode in a program by testing these two flags with the "FS?" or "FC?" command. Unfortunately, the user cannot directly alter these flags to set the desired display mode (at least, using only HP's built-in capabilities).

In fact, all flags numbered 31 and higher are system flags that the user cannot directly control. Why is that? I can think of a few reasons:

  1. The user ought not to be able to control many of these flags (e.g., flag 49 -- low battery).

  2. The user could set the flags to an indeterminate value (e.g, flags 42 and 43 both set).

  3. Specific commands are provided which will set these flags appropriately (e.g., DEG, RAD, FIX, DMY)

The user can control USER mode by setting or clearing flag 27. This is handy to use within a program in lieu of commands that might be called "USERON" and "USEROFF", or if the USER button is broken.

Flag 48 (ALPHA mode set) is a system flag. What if the ALPHA button is broken? The only answer I know is to read the ALPHA command via the Wand.

-- KS

Edited: 7 Nov 2006, 2:01 a.m.


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