Electronic engineer from Denmark signing in.
My first computer at all was the Maraton 32K purchased second hand in 1983. Originally sold from a toy store in Copenhagen.
A lot of fun learning Basic via small programming examples in data magazines, and re-entering the code when the power plug glitched...

As a present, at age 14, i upgraded the computer with a 16K RAM module, now able to enter a lot more Basic.
Last year i found a Lambda 8300 (another label, but identic to the Maraton 32K) with a 32K RAM expansion module, second hand.
The Lambda 8300 was apparantly updated with a modified ROM, which included som modifications to the connections on the board.
Anyway, i found this fora during my research for Lambda schematic and other usefull information, during my attempts to bring the Lamda alive again. Best regards
Jesper Petersen