writing device drivers for Ultrix-32

[Richard Stevens]

Does DEC supply any information on writing device drivers for
Ultrix-32 ??  I just looked through the V2.2 manuals and
couldn't find anything.  The reason I ask is that we've
made modifications to the 4.3 BSD DMF-32 driver to support
the synchronous port for SNA LU 6.2, PU 2.1.  I know DEC
doesn't support the synchronous port of the DMF at all,
so we'll need to add this support.  I'm also afraid that
DEC has changed the device-driver-to-kernel interface in
small ways from what we've been used to with 4.3 BSD - can
anyone confirm or deny this ??  As I recall, we had a device
driver for Ultrix V1.2 that broke when we installed it in V2.0.

	Richard Stevens
	Health Systems International, New Haven, CT
           { uunet | yale } ! hsi ! stevens