The coding, unfortunately, is not similar enough to the
1003-wah to make 
the
 code directly portable, but there are simply more
registers in the IDE. 
The only additional register is the FDC control hence the second CS.
I used the 1003spec as I had that for writing code as it was more complete.
 from what I could see for drives that were smaller than
500mb the two are 
identical.  for larger dirves that could be different (things like
LBA and
all).
Allison