HP 20b Sale in Germany

[SammysHP]

(03-11-2024 07:36 AM)Erhan Wrote:  On the usb to ttl adapter the tx and rx lines are written on the silkscreen. After I switched the rx and tx line to the calculator pins I was able to flash the wp34s full bin software with the samba.exe application.

Usually RX goes to TX and vice versa. It's always from their respective point of view.

As mentioned in my update, it worked with an FTDI adapter. Seems to be very finicky with the timing and the PL2303 and CH340 might be slightly different.

I know, I'm late to the party, but let me tell you my first impressions of the WP firmware: For the WP 34s you really need an overlay. Too many functions on each button with three shift keys.
The WP 31s on the other hand can be used with a few minutes of memorizing the important buttons. As a reference I printed the layout on a small piece of paper and glued it to the backside of the calculator. Using it as a four-banger for quick number crunching that's sufficient. Only functions I miss so far is the integer mode with base conversion!

edit: Just noticed that my serial numbers are pretty close, within 10. So they appear to be still in their original box and taken out top down! Wonder where they found that pallet.