DEC Pro 350/380 Memory Cards - Interchangeability?

Rob Jarratt robert.jarratt at
Mon Aug 29 11:33:56 CDT 2016

> -----Original Message-----
> From: Paul Koning [mailto:paulkoning at]
> Sent: 29 August 2016 15:08
> To: rob at; General Discussion: On-Topic and Off-Topic Posts
> <cctalk at>
> Subject: Re: DEC Pro 350/380 Memory Cards - Interchangeability?
> > On Aug 28, 2016, at 5:11 PM, Rob Jarratt <robert.jarratt at>
> wrote:
> >
> > I have a 350 and 380. Neither work. The 380 is reporting a possible
> > memory error on the LEDs. Will the 350's memory work in a 380 (or vice
> versa)?
> The 380 has memory on the motherboard, and a model-specific
> daughtercard for expansion memory.
> It seems reasonable that the Pro bus (I/O card) expansion memory should
> work in both models, but I don't have any to try that.
> If you have a 380 complaining about memory and it has a Pro bus memory
> card installed, I'd suggest removing that card to see if it's happy with
just the
> stock motherboard memory.
> 	paul

Just reading your reply again. Are you saying it has enough memory on the
board, without using a daughter board? I did see lots of memory on the main
board, but assumed it was video memory. I did try removing the daughter
board altogether at one point, but it still didn't work. :-(

I wish I had a logic analyser.



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