Yes yes I know, this is not a gallery but I couldn't resist to put it somewhere.

No bugs, very clear design:

Reason behind this thread is, I just got my original 35. Not mint, but w/ an intact sticker and a working on/off switch. Share my excitement, please :-).

I hope you incorporated all the original HP-35 bugs....

Hallo Thomas,

this is a very clean design. However, it looks like painted around 1400: there is some idea of a central perspective, but the painter is not fully proficient in it yet ;-)

Sorry, no old bugs. Just new one.

Indeed. And he never will, I fear ;-).

Oh, at least not in the morning when he's too tired to do something less nonsensical.

Put a two-line LED display on that pup, and you'll have something worthy of "The Sharper Image".

(I'm imagining a retro-themed gift item, with a full-page ad in all the airlines' seat-back magazines.)

I would prefer it to be in the original 35 case. 4 line LCD and no bug.

I tried, but very much to my surprise the button cells ran empty in minutes! I still have to inverstigate this strange phenomenon.

It's difficult to develop a sound design in this case. If it's too light, it feels like a toy. Add some weight and it takes braces to keep your shirt in place when carrying in your shirt pocket (I guess you all tried a classic in your shirt pockets).

Allow it to be slightly thinner than a classic and we have a deal.

Sooo....

The on/off switch is under the elastic strap?

B^)

Erm...as well as the red dot, yep ;-)

Sorry, I'm confused. Is this an artist's rendering of a 35II or is this a real calculator? Judging by the posts, it appears to be a prototype, but it looks like a painting. What's the background behind this post?

Thanks,

Gerry

Fantuseee.

Okayyy. That's a little scary. My wife already thinks I've gone off my rocker playing with my 41Cs and peripherals, 48GX, 49g, 49g+ and 50g. If I showed her this post, I might never be let out of the house.

I do like the picture though. Good job.

Gerry

Quote:

---

What's the background behind this post?

---

It's an exercise in nostalgia. Note the x^y key and the arithmetic function keys to the left of the numeric keyboard.

Quote:

---

What's the background behind this post?

---

My conclusion: It looks silly ;^).

But - a nice red OLED, this keyboard and a straight and _small_ case would make up for a perfect aniversary model. Im still puzzled about how to design the switch. Maybe it shouldn't have any? Activate on keypress, deactivate after some idle time? That would be another "first" in HP calculators.

Hm, HP...would you please...

Hello, Thomas!

Quote:

---

Reason behind this thread is, I just got my original 35.

---

Welcome to the club!

Quote:

---

Share my excitement, please :-).

---

We do!

Early last month, as an exercise I had do make a 20-minute presentation on a random subject. The title of my presentation was HP-35 - A Technological Innovation. I ended up talking about 25 minutes! At the end, as a surprise, I handed the real thing to the audience (teacher and 15 colleagues). Some were even able to do simple calculations, as I had talked about RPN too :-)

Beautiful, isn't it? :-)

Now, try this simple puzzle: switch your HP-35 on and make it display 35. without pressing any ivory key.. The least number of keypresses the better (even better if you do it with less than 14 keypresses :-).

Regards,

Gerson.

This is a beautiful picture! I don't have a 35, but I'm curious if the following 12 inelegant steps would work:

e^x

enter

enter

+

enter

enter

+

+

enter

*

x<>y

-

cheers

Peter

Hi, Peter!

Your 12 elegant steps do work nicely. My 14-keypress solution pales next to yours but I'll list it anyway :-)

e^x ENTER^ arc tan x<>y ENTER^ + ENTER^ ENTER^ + ENTER^ + + -

Cheers,

Gerson.

Edited: 20 Dec 2007, 3:16 p.m.

I had exactly the same idea to calculate 45 first, then saw Peter solved it straight forward. Thanks for the nice exercise, Gerson :-).

Now I have to show mine I guess :-)

It's a german model.

Looks really nice! I have the complete set also, but the latch in the travel case is broken.

Have fun! :-)

Cheers,

Gerson.

My 11 step one is similar the other..

cos x
Enter
Enter
Enter
+
x^2
+
+
x^2
x<>y
-

Of course this is on a 35s, so may work differently on an actual 35. On a 35s I guess I could write a program to display 35, but that would be cheating. ;)

Edited: 21 Dec 2007, 7:41 p.m.

Here's another 12 step solution:

cos

ENTER

ENTER

+

ENTER

ENTER

1/x

arc

sin

+

+

+

Stefan

Sorry, no x^2 on a 35 :-/

Your solution works on the 33s (I gave away my HP-35s). On the original 35 it returns 36.00000001.

cos

ENTER

ENTER

+

ENTER

1/x

arc

sin

+

+

+

+

This slight change in your solution makes it work on the 35 (but not on the 33s), despite the decimal part.

Too bad the 35 lacks 10^x :-)

e^x 

ENTER^ 

arc 

tan 

x<>y 

10^x 

-

If you don't have a 35 to play with, I would suggest Eric Smith's
Nonpareil.

Regards,

Gerson.

P.S.: A 13-keypress solution using blue keys only:

EEX

ENTER^

ENTER^

+

ENTER^

ENTER^

+

ENTER^

*

ENTER^

+

+

+

Edited: 22 Dec 2007, 10:12 a.m.

Quote:

---

Your solution works on the 33s (I gave away my HP-35s). On the original 35 it returns 36.00000001.

cos

ENTER

ENTER

+

ENTER

1/x

arc

sin

+

+

+

+

Do you mean "35.00000001"? I can't imagine how it would produce 36.00000001

This slight change in your solution makes it work on the 35 (but not on the 33s), despite the decimal part.

---

Here is your solution with the stack annotated. Please tell me how this could possibly work:

cos         1 0 0 0

ENTER       1 1 0 0

ENTER       1 1 1 0

+           2 1 0 0

ENTER       2 2 1 0

1/x         0.5 2 1 0

arc  

sin         30 2 1 0

+           32 1 0 0

+           33 0 0 0

+           33 0 0 0

+           33 0 0 0

It produces 33, not 35.

Stefan

Quote:

---

Here is your solution with the stack annotated. Please tell me how this could possibly work:

cos         1 0 0 0

ENTER       1 1 0 0

ENTER       1 1 1 0

+           2 1 0 0

ENTER       2 2 1 0

1/x         0.5 2 1 0

arc  

sin         30 2 1 0

+           32 1 0 0

+           33 0 0 0

+           33 0 0 0

+           33 0 0 0

It produces 33, not 35.

---

In fact on my 33s is does procuce 33. On the original 35:

cos         1 0 0 0

ENTER       1 1 0 0

ENTER       1 1 1 0

+           2 1 0 0

ENTER       2 2 1 0

1/x         0.5 2 1 0

arc  

sin         30 2 1 1 => On the back plate it reads "* FOLLOWING ANY TRIG FUNC-

                                                     TION z IS DUPLICATED INTO

                                                     REGISTER T."

+           32 1 1 1

+           33 1 1 1

+           34 1 1 1

+           35 1 1 1

Gerson.

Greetings, Gerson:

Fun challenge. Here is my 11 step solution:



EEX

Enter

Enter

+

+

Enter

+

Enter

X

EEX

-



Only the blue keys are used and no clearing of the calculator is needed.



-- Richard

Cool!

Quote:

---

Only the blue keys are used and no clearing of the calculator is needed.

---

This is really a greater challenge than just not allowing the white keys. It's great to see the old 35 is still fun after all those years!

Cheers,

Gerson

Hi Gerson. I'm curious to know why you gave away your 35s.

Regards,

John

Hi John,

I could live with the bugs but I just didn't like the exponent being hidden most of times, especially when in STD display mode. I have to remember to send the manual to the happy owner :-)

Cheers,

Gerson.