Although the back clearly states "CPU: 8-bit", when I first looked inside, I thought that there was no microprocessor at all - but there is a "board mount" device on the underside of the board visible to the left. It is a die bonded directly to the board and covered with "wax" (no IC package).
Source: http://www.classiccmp.org/dunfield/index.htm
Trying a search for these two, also for me can find no results
