It's a 256x64 OLED panel, which although smaller (and much thinner) than the empeg VFD, has a visible display area almost exactly the same dimensions. Also 16 grey levels, unlike the VFD's five and half, rounded down to 4

Jon's current software emulates the 128x32 2BPP display on the OLED display in a very convincing manner. The blue one also looks very much like the empeg display, but if anything is brighter.

It's driven by SPI from the raspberry pi expansion port, and also has the same button and rotary encoder layout as on the empeg, with a consumer IR receiver as well.

pca