Threaded Mode | Linear Mode

TomC · 11-04-2022, 02:19 PM

One of the (perhaps?) overlooked features of the PX series calculators is the backlit display.
This is a feature that I appreciate (a lit keyboard would be nice! Smile

)

...and while I'm at it...

A serial interface (for plotter or whatever) and/or an IR interface would be nice options....

TomC

(11-04-2022 03:58 AM)toml_12953 Wrote:
(10-29-2022 07:58 PM)agarza Wrote: So, I really wanted the full functionality of the HP41CX for the PX DIY calculators.
But the ATMEGA328 has very limited memory (both flash and ram). Fortunately, there is a relatively new microcontroller from Microchip. Same physical size and thru hole (28 pins) but with lots of ram and flash.

So what's the advantage over the SwissMicros DM41X? (other than cost, of course.) It seems like the DM41X is a better choice if you want to add modules without reflashing the whole thing or if you want to print to an infrared printer.
Also, the DM41X is a portrait format, more like the original calculator.

Now if yours could interface with plotters, floppy drives, printers like the original, that would give it an edge over the SM version.

agarza · 11-19-2022, 04:53 PM

Can you comment on first prototype:
Photos here:
PX-41CX Gallery

I'll upload a video soon.

TomC · 11-19-2022, 06:00 PM

Very Nice!!! ..why the EEX - CHS key swap?

TomC

(11-19-2022 04:53 PM)agarza Wrote: Can you comment on first prototype:
Photos here:
PX-41CX Gallery

I'll upload a video soon.

TomC · 11-19-2022, 06:02 PM

Back-lit display?

(11-19-2022 04:53 PM)agarza Wrote: Can you comment on first prototype:
Photos here:
PX-41CX Gallery

I'll upload a video soon.

agarza · 11-19-2022, 08:20 PM

(11-19-2022 06:02 PM)TomC Wrote: Back-lit display?

Yes, same display.

Sylvain Cote · 11-20-2022, 02:25 AM

(11-19-2022 04:53 PM)agarza Wrote: Can you comment on first prototype:
Photos here:
PX-41CX Gallery

I'll upload a video soon.

Nice!

The MENU button is a great idea.
Just make sure that GETKEY/GETKEYX return the following values for the top row, so that existing programs does not break.

Code:

Value Key

1     ON

2     USER

3     PRGM

4     ALPHA

5     MENU

agarza · 11-20-2022, 02:54 PM

(11-20-2022 02:25 AM)Sylvain Cote Wrote:
(11-19-2022 04:53 PM)agarza Wrote: Can you comment on first prototype:
Photos here:
PX-41CX Gallery

I'll upload a video soon.
Nice!

The MENU button is a great idea.
Just make sure that GETKEY/GETKEYX return the following values for the top row, so that existing programs does not break.

Code:

Value Key 1 ON 2 USER 3 PRGM 4 ALPHA 5 MENU

The MENU button is not mapped in the emulator. GETKEY will not register the MENU key beeping pressed.So nothing will be broken.

Liam Hays · 11-20-2022, 05:15 PM

Very cool! Do you intend to sell it for the same price as the Voyager-sized calculators, and will it still be available as a kit?

Also, I agree with TomC---why swap EEX and CHS? Just for cosmetics?

agarza · 11-20-2022, 07:30 PM

(11-20-2022 05:15 PM)Liam Hays Wrote: Very cool! Do you intend to sell it for the same price as the Voyager-sized calculators, and will it still be available as a kit?

Also, I agree with TomC---why swap EEX and CHS? Just for cosmetics?

Same idea as the voyager series. Just better micro and portrait form. And price should be similar.

I swapped the EEX and CHS by mistake. They will be corrected on the next revision.