Problem with RF73 DSSI disk

Johnny Billquist bqt at
Fri Sep 4 12:00:21 CDT 2015

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 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 


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