HP-IB spec?

Since it appears my bootrom rev doesn't know how to netboot, and
doesn't even recognize this SCSI card as a SCSI card, it looks as
though I have to boot over HP-IB.

The problem, of course, is a lack of HP-IB disk.  (I have maybe
500+100+100M of it, I think the 100M disks don't work, and it's been at
least a year since I tried the half-gig disk.)

I have an IEEE488 Sbus card, but no information on the interface it
persents to the host, so that's not much use.  So I was thinking, how
complex is it?  Is it something I could drive off a generic parallel
port with some glue logic?  Some poking around indicates that there is
no reason this couldn't be done - for example, the interface is
(almost) entirely async and thus can run at slow data rates - but while
I've been able to find some information on the lowest level of the
protocols (in particular the NRFD-DAV-NDAC handshake) I haven't found
anything above that, and in particular not enough for me to make the
parallel-port host look like a disk to the hp300.

Is this information available?  Presumably it once existed, and likely
still does in some engineers' heads....

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