[comp.sys.amiga.tech] Need help with Device Driver

thfisher@lion.waterloo.edu (Terry Fisher) (12/14/89)

I am trying to figure out how to write a device driver.  Right now, I
need to know which registers are initialized to what values when the
Open, Close, BeginIO, AbortIO functions are called.  I know that a6
contains a pointer to the device, a1 points to the request block.  I also
know that d0 contains the unit numer and d1 the flags on an open.

Are there any others registers set up that the device can take advantage
of?

Thanks,
Terry Fisher			thfisher@lion.waterloo.edu
Waterloo, Ontario, Canada	{...}!watmath!lion!thfisher
(519) 885-2785