HP-19C display question

[J-F Garnier]

The HP-19C has a wider display than the 29C, actually similar to the HP-67.

But is it possible to key in more than 10 digits, as shown on the picture:



I can't do it on my 29C, nor on my 67.

J-F

[rprosperi]

No, not possible, at least not through normal number pad entry; Upon trying that, the display shows "0123456789." and subsequent keys simply blink the display.

Probably a photoshop exercise to break the rules of HP physics...

I suppose there could be some equivalent of synthetic instructions that can generate such a display, but I've never read of such tricks.

Where did the photo come from?

[C.Ret]

On the picture, brightness of the figure is not even. It's look more like the flickering digits that appears rapidly when the calculator is running a program or at computing one function.

Due to the exposition time of the camera, mantissa figure positions as well as exponent figure positions are visible. This make believe a larger integer number can be display or enter than we can possibly type-in. But in reality, figure are display rapidly at any pseudo-random positions due to internal activity.

This alive display with flickering figures is common to numerous other calculators.

[teenix]

A low chance, but it might be possible to have a looped program running where this display is shown most of the time while it is flickering during processing, make a smart phone movie and select the wanted image frame.

Such as...
0
1
2
3
4
5
6
7
8
9
ENTER
LBL 1
Many X<>Y's
...
GTO 1

cheers

Tony

[J-F Garnier]

(07-30-2021 02:12 PM)J-F Garnier Wrote:  The HP-19C has a wider display than the 29C, actually similar to the HP-67.

Actually, I was wrong, the 19C display is not the same than the 67.
The 67 has a 15-digit display, able to fully display the sign, the mantissa (10), the dot and the exponent with sign (3) : total=15.
The 19C (that I don't own) seems to have a 13-digit display, using a full digit for the dot, otherwise working like the series 20.
Is that correct? Are they other LED models using the same 13-digit display?

J-F

[Thomas Okken]

(07-31-2021 10:21 AM)J-F Garnier Wrote:  The 19C (that I don't own) seems to have a 13-digit display, using a full digit for the dot, otherwise working like the series 20.
Is that correct?

Yes, that is correct.

(07-31-2021 10:21 AM)J-F Garnier Wrote:  Are they other LED models using the same 13-digit display?

Only the HP-10, I think...