Zitat von
hap
It can probably be worked around, in p1_w:
m_maincpu->space(AS_PROGRAM).write_byte(0, 0xff);
Yep, that fixed the problem - many thanks!
Now I can start fixing the layout, too. Fortunately I've already added the xc/yc coordinates to the layout rendering in MAME 0.220 before implementing those 5 engines in turbo16k, so at least I don't need to recalculate hundreds of coordinates anymore. But there are still many new layout features in the current MAME not working correctly in my old version, that I can't take over, because they would need too extensive changes in several files. So I have to find a workaround for these display problems.