Anyone familiar with these vintage touchscreens?

Nigel Johnson nw.johnson at
Sat Oct 19 13:46:07 CDT 2019

Are you sure it wasn't the massive over-funding by government that 
killed it?

On 19/10/2019 14:35, ben via cctalk wrote:
> On 10/19/2019 12:23 PM, Nigel Johnson via cctalk wrote:
>> 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 from Toronto, with a scope, to adjust that pot, since 
>> everybody there was hands-off this external stuff.
>> It may have had a future if HTTP and the internet were not just 
>> around the corner:-)
> Well I think Hook up up to your TV and slower than  hell cheap decoders
> killed the NAPLPS rather than the internet is comming.
> Ben.

Nigel Johnson

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