> Boot file: 0
> Boot flags: 0
> Open 0: no such file or dierctory
> boot fialied! halting

Looks like your box has no default boot filename or
flags set?

At the SRM prompt:

>>> b -flags s -file netbsd dqa0

to boot into single user mode

>>> b -flags a -file netbsd dqa0

to boot into multi user mode

I think the kernel is named netbsd.alpha or some such
rather than just netbsd on the ISO image I've been
playing with.

>>> man boot

will display the SRM man page for the boot command

>>> show | more

will display the SRM environment variables
(yes that is a pipe, SRM is based on Unix)

>>>set bootdef_dev dqa0

will set the default boot device to dqa0

>>> man

will display a list of SRM man pages

http://ftp.digital.com/pub/Digital/info/semiconductor/literature/srmcons.pdf

A useful (but incomplete) document on SRM.