aristo m27Model: 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

R4000 00R4000 01Model: R-4000
Battery: 2 x D cells
AC adapter:
Year: 1978

Chip: TMS1073NL

Info: made in Germany