...It supports two modes of operation, an internal monitor program and a mode that emulates the Heathkit ET3400 (and ET-6800) microprocessor trainers.
Motorola released the MC6800 chip in 1974. It was a source of inspiration for the designers of the more popular (and cheaper) 6502 chip that was used in so many home computers of that era.
The MC6800 is a big-endian processor (hi byte, lo byte order), unlike so many others from that era (6502, 8080).