BTW, I think I was just able to recover the driver for the Univation Disk controller for MS-DOS 2.11 from a univation controller and semi-crashed disk I bought on ebay two years ago... Now to reassemble the drive enclosure to see if I can get it working on real hardware. Looks like there's only 3 registers and maybe an interrupt handler to this driver.... I'll let people know what's up after some testing and fiddling to figure where to put one of the two univation jumpers... If I get it working, is there any interest here in this stuff?