Anyone familiar with these vintage touchscreens?

Judging by the year, it was probably a teletext terminal. There were various field trials of such systems around that era.? We had one in Toronto's Eaton Centre - it was based on NAPLPS, and used a PDP11/23.? There was a lot of Canadian Government money put into research to promote he Canadian vector-based protocol, claimed to be more efficient than the European alpha-mosaic ones.? Ours ran at 1200/150(?) baud. Research was done at a Bell Canada site on Carlingview Avenue in Ottawa under some sort of sub-contract.?? They used Able DMAXes on an 11/70 which had a pot to adjust the 150 baud clock.? They actually flew me up was hands-off this external stuff. It may have had a future if HTTP and the internet were not just around the corner:-) One of the big players in Canada was Infomart, where I installed a bunch of kit on PDP11s, just around the corner from where I now live in Toronto. cheers, Nigel On 19/10/2019 14:02, Jonathan Katz via cctalk wrote: -- Nigel Johnson MSc., MIEEE VE3ID/G4AJQ/VA3MCU Amateur Radio, the origin of the open-source concept! You can reach me by voice on Skype: TILBURY2591 If time travel ever will be possible, it already is. Ask me again yesterday This e-mail is not and cannot, by its nature, be confidential. En route from me to you, it will pass across the public Internet, easily readable by any number of system administrators along the way. Nigel Johnson <nw.johnson at ieee.org> Please consider the environment when deciding if you really need to print this message