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!
There is no law in the arena
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