Subject: Re: PROM versions for r4k upgrades?
To: David Burren <>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
List: port-pmax
Date: 02/22/1998 16:41:52
Jonathan wrote:

> I have a 5000/25 with rev 2.0m PROM, and it's not happy with an r4k
> daughtercard.  What's the minimum PROM version that will support the
> r4000 daughterboards on a 3MIN and MAXINE? 

> Anyone got salvage PROMs from a dead motherboard, or got
> 5000/{20,25,33} DECstation PROMs they'd consider swapping?

>It's now been quite a few months since I eyeballed the guts of a
>MAXine, but aren't the PROMs on the CPU board?

Probably. I had typed text asking that but edited 9it out :).

>Unlike the R4400 (5000/260) board, the R4000 daughterboard for the
>5000/150 or 5000/50 has a pair of DIP switches on it.  The settings
>required for the two systems are different, but I don't recall which
>you need for a MAXine.
>Could this be your problem?

Almost certainly.  There are two DIP switches; the sensible thing
would be to toggle them.  It would be Kewl if this was on the Web
page along with the PROM revision info.