Aristo

Model: M27 version 2
Battery: 5 x AA cells
AC adapter:
Year: 1973
Chip: TMS0105NL
Info: made in Germany

Version 1: Rectangular design, no CE key
Version 2: Rectangular design, red CE key
Version 3: Rounded design, red CE key

Model: R-4000
Battery: 2 x D cells
AC adapter:
Year: 1978
Chip: TMS1073NL
Info: made in Germany