Problems booting Sun 2/50 (*HE

[Freeman Pascal]

We have a Sun 2/50 that we are having trouble booting.  Everytime we try
to bring it up we get an error message that goes something like:

	Low byte parity error <hex value> at address <hex address>

Does anyone know what could cause such an error?  We don't have any
hardware manuals to look the error up in.  Please help.

The sun contains the following:

	5 Mb RAM
	Mono video
	SCSI controller
	SCSI=>MFM (Adaptec4000) controller
	71 Mb MFM hard disk
	QIC11 tape drive

We were thinking that the error could be coming from either something
something on the VME bus or on the SCSI bus.  If this is true, how can we
test it?

Any help would be appreciated.

-Freeman

PS - If someone has an extra set of Sun 2/50 hardware manuals (or even
     a partial set) make me an offer.  I'll probably take them.