edc —
IBM DASD Storage Interface ESDI disk driver
edc* at mca? slot ?
ed* at edc? drive ?
The edc driver supports IBM MCA ESDI disk controllers
  and disks, most commonly found in IBM PS/2 machines. Supported boards include:
  - IBM ESDI Fixed Disk Controller
-  
- IBM Integrated ESDI Fixed Disk & Controller
-  
 
This driver appeared in NetBSD 1.6.
The driver was written by Jaromir Dolecek
  ⟨jdolecek@NetBSD.org⟩.
The driver should also work properly on machines with more than 16MB of memory,
  using buffer bouncing to overcome 24bit MCA DMA limitation.