All things ESDI

[John A. Dundas III]

I'm glad this thread came up.  I had plenty of experience with SMD 
(and friends), MFM/ST506, and SCSI.  But there is a gap of knowledge, 
corresponding with my dim recollection of the '80s, regarding ESDI.

Are ESDI drives compatible with ST506 controllers?

Are MFM drives compatible with ESDI controllers?

I assume the answer to both of the above is no, but I'm looking for 
definitive verification.

Anyone have information or manuals on the Sigma SCD-RQD11/EC 
controller?  How about the Dilog DU686?

Thanks,

John