Just to let you all know, today I committed a new version 
of the DEFxA driver which uses the bus_dma(9) framework.  
So if you want to a DEFTA on a DECstation, all you have to 
do is write the bus_dma implementation for the TurboChannel.

Cheers...
-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Nashua, NH                Disclaimer: I disavow all knowledge of this message