HP41C with Rp Pico attached

[MeindertKuipers]

(12-02-2023 10:25 AM)Tinue Wrote:  Thank you for the video, I found it very interesting. How do you interface electrically with the HP 41? I assume it is a 5V device, while the RP2040 uses 3.3V.

Just simple level shifters. I have a few interfacing boards left from my MLDL2000 activities. I use a CD4050 for downshifting, and an HCT125 for upshifting to 6V (HP41 is around 6V). For shifting up to 6V a 40109 would be a bit better.