Problem with RF73 DSSI disk

Holm Tiffe holm at
Fri Sep 4 14:01:14 CDT 2015

Johnny Billquist wrote:

> On 2015-09-04 18:19, Glen Slick wrote:
> >I just acquired a KA640 VAX in a BA215 (thanks Josh) which has one
> >working RF30 and one dead RF30 with failure code 300B(X). I don't have
> >copies of any manuals which list the error codes. I just figure at
> >this point that the drive is dead and there is nothing that can be
> >done to try to fix it.
> You could/should try and run some diagnostics. Maybe they can print out 
> something more intelligible than just an error code?

The can dump out several statistices and even registers from the MC68000
CPU at the time the error was occuring, that's documented, but not more.
The Users Manual says that the error codes could be found in the service
manual, but I don#ät think that there is one available for the DSSI disks
on the net.
> >The working 150MB RF30 is too small for a useful VMS system although
> >it would be a decent size if I set up the system as a PDP-11 with an
> >M7554-PB KDJ11-SB CPU instead of the VAX KA640.
> Be aware that no PDP-11 system knows about DSSI. There is one Qbus DSSI 
> controller that looks like a simple MSCP controller, and that one should 
> work fine. Any that exposes more of DSSI will be a non-starter with a 
> PDP-11.
> 	Johnny

Such small drives was meant for paging/swap locally, not more.
This makes sense in a cluster environment where the machine boots from
network and the Users data are on the net also.


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