IDE hard drive on original IBM AT?

[Marvin Johnston]

I haven't tried using an IDE drive with a real IBM AT, but I suspect it
will not be plug and play! The original BIOS supports 15 predefined
drive types and I don't remember any user defined settings. You might
try something like "Disk Manager" or other such utilities. IIRC, they
can allow larger than the 32 MB partition sizes and I *think* will allow
settings other than what IBM provided.

> I have two "true-blue" IBM ATs, both the early motherboard revision. 
> I have the following questions:
> 
> - Is it possible to use an IDE hard drive instead of MFM?  I have
> tried several different drive/controller combos, and nothing works so
> far :-( .  The drives are small ( < 100 MB), so it's not a geometry
> issue (at least, I don't think so :-) )