Hi, I just wanna mention that comparing to this foto
https://www.schach-computer.info/wik...150Platine.jpg
my device has different platine (see attachment): R65c02-4Mhz (vs 3), newer NEC controller produced 1989 (vs 1988), faster RAM - 12ms (vs 15) and probably faster ROM (marks: AMI 9002MAO; YO1GH; C12E U3).
Also there's an empty slot for additional chip (EGR or RAM?)