@tulippc, I only see this message now. The boards have been in manufacturing for the past few weeks and now getting ready to continue with the Troll.
It would be great if we share notes on the development. Please drop me a line at knivd at me.com.

I will have a look at Mongoose-OS as well. Just finished with the redesign so now ESP-PSRAM is on board instead. Almost ready to make the new revision now (hopefully the final one).

Point taken. Fortunately I still have not sent the latest revision to the factory, so it is a good time to change that chip. The only downside is that it is volatile memory, but I guess that is something acceptable. EDIT: Hmmm... it looks like the ESP-PSRAM32 IC is 1.8V device. That would require le...

I would suggest to use ESP32 with external SPIRAM (e.g. ESP32-WROVER), it works great with latest esp-idf and you have up to 4MB of Python heap...

That was one of the small changes I made in the new revision. Now the board includes an optional footprint for SPI MRAM (such as MR25H40).

Great. The Micropython might be a good fit. The keyboard is not a problem because it is served by a separate controller (pic18f45k50), which can be used also to upgrade the esp32's firmware via usb. Beside that one there is only one other major chip - ft813 for the display. Does your port support th...

This is my new development, successor to the ELLO 2M. At 3.9mm total, it is one of the thinnest systems ever, yet it is much better expandable than the 2M. Main processor - ESP32. Hardware still in early stage and I had to fix a few small issues, but the big question that I am facing - software. I w...

I am preparing a schematic with the ESP32 chip now, and I want to connect an SD card to the SD_xxx pins 28-33. My problem is that I can't figure out how to separate the SD card from the flash memory which is connected to the same pins. I want to use the SD card in 4-bit mode as standard via the ESP3...