4.2 BSD Device Drivers

[Mike Kibler - System Manager]

   I am looking for a good book or article on how to write
device drivers for 4.2 BSD. I will be adding a couple of
DMA drivers to our VAX 11/750 very shortly and would like
a more top level description than 4.2 code. Anybody know
of such a book/article? Please send replys to mike at wsu. 


    Thanks