I understand the issue. I only have one 4x20 display, and one 2x24. I'm not sure how the 2x24 would work - as that isn't a standard LCD geometry.

As for trouble later, I'm an experienced electrical engineer, but I'll understand if you sell the board without a warranty. I did once teach students how ...

I recently bought a small supply of bare Noritake U-series VFD's. For those wondering; these are LCD emulator VFD's that have the same pin-out and command set as a standard HD44780 based LCD.

I have been looking for serial "backpacks" for these, and I like the firmware of the Matrix Orbital ...