Metal case is 1.75mm thick. Keyboard weighs 6lbs, 7.7oz.
Had to open it up and take a peek. I was anxious to:
Sorry for the dirt in the photos; these are pre-cleanup.
I was able to find a datasheet on the NEC uPD8049H; it is an 8-bit microprocessor that can run up to 11MHz. It has 128 bytes of RAM, 2KB of ROM, 27 I/O lines. The datasheet pinouts for ground, power, and external crystal match what I observe on the PCB. It is being run with a 2.4576MHz crystal.
