Unibus/QBus transceivers and drivers - was Re: PDP-11/20 in Iowa (x3)

Toby Thain toby at telegraphics.com.au
Mon Mar 27 20:51:34 CDT 2017

On 2017-03-27 6:46 PM, Ethan Dicks via cctalk wrote:
> On Mon, Mar 27, 2017 at 6:35 PM, Steve Malikoff via cctalk
> <cctalk at classiccmp.org> wrote:
>> After seeing this modern memory board project for the PDP-8/e using NVRAMMs
>> http://www.tronola.com/html/ram_for_pdp-8e.html
> I have a couple of those I need to solder up.
>> I wonder how much effort it would be to refactor the Omnibus logic to Unibus
>> to build a PDP-11 version, and thus have a quad size card for /15's and /20's?
> Conceptually, it's not much different for Unibus.  There's at least
> one project out there that's working toward this but not yet available
> for purchase.
> If I was in a real hurry, I could take a quad prototype board and roll
> my own.  I happen to have a handful of DS8641s on hand from making
> Unibus COMBOARDs 25 years ago.  The quantity of discussion on this
> list about modern Unibus transceiver replacements is rather large and
> merely mentioning it is likely to cause a flare-up.

It just begs for a conclusive summary. Perhaps those who are actively 
building stuff will eventually provide one (not necessarily on the list 
per se) :-)


> -ethan

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