## WP34S for the DM42

This is where developers can exchange ideas and ask questions relevant to the DM42 firmware.

Please note that Swiss Micros staff are unable to provide answers here as a general rule. This is intended as a community-driven forum.
rprosperi
Posts: 1120
Joined: Mon Apr 24, 2017 7:48 pm
Location: New York

### Re: WP34S for the DM42

I'd say in 2 places:

1. On the MoHPC in the Not Quite... Forum

2. In the Discuss Forum here on this site. Even though the 34S and 31S are mostly unrelated (excepting of course the recent port to the DM42 platform) lots of folks using those devices, and wanting to, congregate and look around here, due the 43S activity. Makes sense to make it easier for folks to find info they're looking for.
--bob p

DM42: β00071 & 00282, DM41X: β00071 & 00656, DM10L: 071/100
Walter
Posts: 1914
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

### Re: WP34S for the DM42

Yes, in principle. But I can care of the WP3xS support on this very forum here; I can't on the MoHPC, for vacational reasons since 2016.
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
dlachieze
Posts: 317
Joined: Thu May 04, 2017 12:20 pm
Location: France

### Re: WP34S for the DM42

rprosperi wrote:
Wed May 26, 2021 5:15 pm
I'd say in 2 places:

1. On the MoHPC in the Not Quite... Forum

2. In the Discuss Forum here on this site. Even though the 34S and 31S are mostly unrelated (excepting of course the recent port to the DM42 platform) lots of folks using those devices, and wanting to, congregate and look around here, due the 43S activity. Makes sense to make it easier for folks to find info they're looking for.
Done for the Discuss forum: Manuals for the WP34S / WP31S
Done also on MoHPC.
DM42: 00425 - DM41X: β00066
akaTB
Posts: 621
Joined: Tue May 02, 2017 1:56 pm
Location: Milan, Italy

### Re: WP34S for the DM42

Walter wrote:
Wed May 26, 2021 6:10 pm
I can't on the MoHPC, for vacational reasons since 2016.
Greetings,
Massimo
ajcaton
-+×÷ left is right and right is wrong Casted in gold
Walter
Posts: 1914
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

### Re: WP34S for the DM42

akaTB wrote:
Wed May 26, 2021 7:59 pm
Walter wrote:
Wed May 26, 2021 6:10 pm
I can't on the MoHPC, for vacational reasons since 2016.
Certamente, Massimo, you know. Though I know that my judge was demoted to plain member - but his false verdict is maintained. Such is justice in the Wild West. Though that's no singularity, there are many processes being hardly understandable beyond the Atlantic. I feel blessed living in Europe.
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
rprosperi
Posts: 1120
Joined: Mon Apr 24, 2017 7:48 pm
Location: New York

### Re: WP34S for the DM42

Walter wrote:
Wed May 26, 2021 9:33 pm
akaTB wrote:
Wed May 26, 2021 7:59 pm
Walter wrote:
Wed May 26, 2021 6:10 pm
I can't on the MoHPC, for vacational reasons since 2016.
Certamente, Massimo, you know. Though I know that my judge was demoted to plain member - but his false verdict is maintained. Such is justice in the Wild West. Though that's no singularity, there are many processes being hardly understandable beyond the Atlantic. I feel blessed living in Europe.
Indeed, many of us are blessed you live in Europe...

...and yes, it is a joke, but it was just such an excellent opportunity, I could not let it pass...
--bob p

DM42: β00071 & 00282, DM41X: β00071 & 00656, DM10L: 071/100
Walter
Posts: 1914
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

### Re: WP34S for the DM42

rprosperi wrote:
Wed May 26, 2021 10:55 pm
Walter wrote:
Wed May 26, 2021 9:33 pm
... I know that my judge was demoted to plain member - but his false verdict is maintained. Such is justice in the Wild West. Though that's no singularity, there are many processes being hardly understandable beyond the Atlantic. I feel blessed living in Europe.
Indeed, many of us are blessed you live in Europe...

...and yes, it is a joke, but it was just such an excellent opportunity, I could not let it pass...
Seems to be a win-win situation so far. Obviously not for logic and justice but apparently for people.
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
Nigel (UK)
Posts: 55
Joined: Fri Jul 21, 2017 11:08 pm

### Re: WP34S for the DM42

lrdheat wrote:
Tue May 25, 2021 6:44 pm
Hi Nigel,

I was trying to use SLV f’(x)’F0’ with my F(0) program of the function x/(2x+1)^3 to find an extremum. An extremum is at .25, but my unit is coming up with .2520. My physical WP 34S (repurposed HP 30b) comes up with the correct .25 Is it possible that I need to specify a small epsilon (and how do I do so?)? Same program in both units!

lbl F0
2
*
1
+
3
Y^x
/
RTN
I think your question has probably been answered by Walter, but just to confirm: the mechanism is the same on the DM42 version as on the real thing. You need to write a program that starts with $$\delta x$$, $$\Delta x$$, $$\delta X$$, or $$\Delta X$$, and that returns the value of $$\epsilon$$ that you wish to use.

It might be convenient to make the content of this program RCL 99, so that you could store your favourite value of $$\epsilon$$ in register 99. This would also allow you to put this program in the flash region, as you wouldn't need to change its contents when changing the value of $$\epsilon$$.

Thank you for your continued interest!

Nigel (UK)
lrdheat
Posts: 11
Joined: Tue May 02, 2017 6:17 pm

### Re: WP34S for the DM42

Hi Nigel,

I’m having difficulty typing/finding the symbol delta x or delta Greek d, even outside of a program. How do I find these characters? Do I call the program (symbol)delta (Greek) d? How do I type the delta (symbol) d (Greek character) into the label command?
dlachieze
Posts: 317
Joined: Thu May 04, 2017 12:20 pm
Location: France

### Re: WP34S for the DM42

On the WP34S greek symbols in alpha mode are on the g-shifted plane, on the DM42 port of the WP34S press Shift Shift D to get the $$\Delta$$ character, press Shift ON before for the lower case $$\delta$$.
DM42: 00425 - DM41X: β00066