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.
