Hi,
although some changes for SCU support can be seen as related to the VME
bus and its registers, Hatari does in fact very little regarding VME
itself, so it's quite possible it doesn't behave similarly to a real TT
as you describe.
But using reports as yours comparing real TT to emulation, it should be
possible to improve this, especially returning bus error should not be
too difficult (as Hatari doesn't support VME card emulation)
Any chance to get this implemented/fixed? After looking at the sources I
do not know how to do this, but maybe for somebody who has more insight it
is just a minor effort?