Hello,
Surprise!
Just before I knew Achim was going to send me his Constellation 3.6 for reverse engineering, I started bidding on a broken unit on eBay... with the intention of studying it and performing romdump for MAME. Since I don't like to withdraw from the auctions even I didn't want this computer anymore, I was finally the winner, and I received it yesterday afternoon.
https://www.ebay.de/itm/174002199372
It was worth it! Because it has a very different ROM.
Achim's unit
s/n: 362168
Q.C.Passed label: 1/85
ROM reference: 831A 6133-8316
ROM header: (c)1982Kittinger
This unit
s/n: 366966
Q.C.Passed label: 4/86
ROM reference: 854-501
ROM header: (c)1985Kittinger
The PCB references are the same.
Sending right now to hap and Franz the romdump.
There are still many surprises to discover with these little computers!
Regards,
Gerardo