Ok, I got the Steinitz 4MHz and 20MHz working!

I've now checked the clock with a stopwatch, and both versions are running 10% faster, so I've also changed the line VIA6522(config, m_via, 2000000) to VIA6522(config, m_via, 1800000) and then the clocks are ok again - but of course now 10% slower for Sargon 2.5 and Sandy.

So I've one question again:
can I also change this VIA6522 to 1800000 in the cartridge load function with any command?
Just adding VIA6522(config, m_via, 1800000) there doesn't work.

Edit: Ok, I just found a command m_via->set_clock(), I guess this might work - I'll test it ...

Edit2: Yep, that's indeed working! Hartmut kann sich freuen ...