One additional remark:
I own one of these FRAEL Bruc 100 computers, you quoted some german text from my webpage in this thread.
This unit i working with MSX1 cartridges without problems.
I got this nice little computer 3 or 4 years ago from Austria together with an german manual and a cartridge.
As you may imagine, this was a real MSX1 cartridge ...
Last year on VCFE 8.0 (vintage computer festuval) in Munich, the long time MSXer Wolfgang Borrmann and me were checking this computer in real.
Take a look at his review about the VCFE 8.0 and FAEL Bruc 100:
http://www.wolfgangborrmann.de/aussvcf80.htm
We classified this computer as MSX "Compatible" ...

It would be intersting to get more information about it, ROM dumps, memory layout, etc. THen we could even emulate it, probably.