[comp.sys.dec] What's a DU?

gary@minster.york.ac.uk (10/21/90)

I've been looking at disc controllers to put on my
ancient lsi11/23. (I'm getting worried about backups.)
I recently saw a controller advertised which was supposed
to "emulate a DU". My data books seem to be too old to
mentions DUs. Could someone tell me what they look like.
Or better still send me a driver that works under 7th ed.

Thanks... gary