NEW: HP 15C Collectors Edition

[dmh]

Thanks again Eric.

So the software looks like it can download the current image, is that correct?

Then I just need to find the patch details.

Does anyone know the pogo pin pitch? I've found 2mm and 2.54mm versions.

(11-02-2023 06:05 AM)Eric Rechlin Wrote:  

(11-02-2023 05:00 AM)dmh Wrote:  Thanks for the detailed information and photos Eric !

A previous post mentioned a button was still used, which line has the button connected?

It appears the wiring is direct and not going through the chip at all now, is that correct?

So if you can roll your own pogo type connector could you could make a new cable the same way?

So, where do I get the firmware (original and patched) and what software is now required?

Thanks again.

The Reset button and Erase button are both still connected. You don't need Reset because you can just use the reset hole on the calculator instead, but the button is more convenient. It's connected in the same place as the old cable, which I believe is pin 2, which would be to the left of the black (ground) wire, lower left corner, in the last image above. I believe Erase is pin 6, which would be to the right of the black ground wire, lower right corner. It's also unchanged from the old cable.

Wiring is indeed direct, bypassing the chip. The chip was only used for the TTL to RS-232ish voltage level conversion. Since the new calculators speak USB directly there is no need for any level shifting.

As long as you have something to work for the pogo connector, which is the toughest part, you can make your own cable.