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. http://www.classiccmp.org/cini Long Island S100 User’s Group Get Outlook<https://aka.ms/qtex0l> for iOS ________________________________ From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Bill Gunshannon via cctalk <cctalk@classiccmp.org> Sent: Tuesday, December 29, 2020 9:30:29 AM To: Jon Elson <el...@pico-systems.com>; On-Topic and Off-Topic Posts <cctalk@classiccmp.org> 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? bill
