Does anyone have an H11 and need a H27 card? -spam

Richard Cini rich.cini at
Tue Dec 29 08:49:20 CST 2020

Backplane connectors were soldered to a custom PCB. It wasn’t a stock DEC backplane. Boards have to be installed “serpentine” I believe.

I have an H11 in the attic. Don’t use it much any more now that I have an 11/23+ in the shop.
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From: cctalk <cctalk-bounces at> on behalf of Bill Gunshannon via cctalk <cctalk at>
Sent: Tuesday, December 29, 2020 9:30:29 AM
To: Jon Elson <elson at>; On-Topic and Off-Topic Posts <cctalk at>
Subject: Re: Does anyone have an H11 and need a H27 card? -spam

On 12/28/20 10:20 PM, Jon Elson wrote:
> On 12/28/2020 07:18 PM, Bill Gunshannon via cctalk wrote:
>> As far as I knew it was a real DEC CPU Module.  I expect any application
>> that ran on RT-11 on the LSI-11/02 would have run on the H-11 but then,
>> you couldn't just walk into your local computer hobby shop and by RT-11
>> software.  :-)
> Yes, it was a totally stock DEC LSI-11 CPU, but most of them didn't have
> any other
> Dec components except the backplane.  All the memory, serial and printer
> interface cards
> were made by Heath.

Was it a DEC backplane?  Any idea which one?


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