I got tired of pulling the SD card out of my PicoCalc and walking it over to my laptop every time I wanted to copy a file, so I wrote PicoCalc-SD-Drive. Grab the appropriate .UF2 file for your RP2040 or RP2350, flash it (or load it with the UF2 loader), Plug the PicoCalc into a PC with a USB cable and it shows up as an ordinary USB drive, using the PicoCalc’s own SD card as the disc. The PC handles the file system, so you can copy files on and off the card without taking it out, and the PicoCalc’s screen shows what the drive is doing. Keys let you eject it, write-protect it, or reboot to BOOTSEL. It runs on both the RP2040 and RP2350 PicoCalc. One honest warning: it’s slow, about 0.3 to 0.6 MB/s, because the Raspberry Pi Picos only have USB 1.1. That’s fine for programs, screenshots and documents, but for bulk copying you’ll still want a card reader. It uses Blair Leduc’s picocalc-text-starter and is MIT licensed. Download: GitHub - Dzubin/picocalc-sd-card: Make a PicoCalc look like a USB drive using its SD card (RP2040 and RP2350) · GitHub
.UF2 files are on the release page: Release V0.01A · Dzubin/picocalc-sd-card · GitHub
Remember: THIS IS SLOW. Not a bug. that’s just the way it is.