> Playing a bit more with the driver and dumps, I have found: > The current Supported MAME image as well as the Happ image (both rev. 2.01) have > attract audio on as default. Where as the others do not. > > The Happ dump I have will play in MAME full speed, but none of the non rev. 2.01 > dumps will. They all suffer from lag. > > BTW: the Happ drive I have is a Seagate ST320014A > > Just more useless information!
When I added it, I assume it was simply a matter that your CHD had different addresses needed to apply speedups - so the speedup hacks in the parent set would not work for the one added.
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