DEC Pro380 problems

Paul Koning paulkoning at
Tue Jul 23 19:45:10 CDT 2019

> On Jul 19, 2019, at 10:52 PM, Eric Dittman via cctalk <cctalk at> wrote:
> I pulled my Pro380 out of storage after getting a replacement
> VR201 monitor.  I connected it all together and on powerup I
> get the following display:
> The tech manual says this is an error from slot 1 (the hard
> drive controller) and the error is "Non-existent memory trap
> occurred for longer than 20 seconds".
> I reseated all the cards.  I noticed three ICs are missing on
> the hard drive controller but I don't know if they are empty
> or someone removed the ICs (I can't remember where I got this
> system).  I can't find a picture of the controller to compare.
> The missing ICs can be seen here:

That's normal.  I have a working 380 (well, last time I powered it up) and it has the same three empty sockets as yours.

The description of the error code isn't very clear.  It might mean that the card is detected (slot present register says there is a card) but the attempts to read the card ID code and associated selftest ROM failed.  That would explain why the second line is 177776 rather than the card ID (000401).

You might need to clean the connector contacts (connector and backplane) and also check for damaged contacts.


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