On Sun, 6 Oct 2002, John Lawson wrote:

> It boots from two Micropolis 51/4" half-height drives sitting in the > card bay of a card-less 11/23 chassis... which has been re-badged by > Centaur Software. The front panel switches control write-protect, now. > I don't have models right now, since I didn't work on that device yet. > But they connect to a Dilog DU686 controller card - a quad-height card > with one common 34-pin ribbon and individual 20-pin ribbons going to

> (of 2 drives). This is... MFM, no? the original owner called them

Certainly not SCSI, but are either ST506/411 (what you called MFM) or ESDI. Check the controller capabilities or the interface of the drives before you swap in a different drive that "looks the same". The connectioons are NOT the same.