Amazing thread! The amount of research that has gone into this.
You're very kind, but all the info is out there for anyone who thinks it's worth looking for. I'd been watching a lot of football from this era anyway, and it really stands out how much graphics have changed.
About those 1990s BBC graphics, and how rarely they changed... What was the BBC scorebar at Euro 2000, does anyone know? It's something that YouTube didn't answer easily.
Argh, I wasn't being serious! From thinking about it some more, it was probably just Sky's green colours that reminded me of
the USA '94 video game colours.
This is all amazing information, thank you:
I looked into this subject a few years ago. The origin of scorebars is lost in time. Early examples date back to the 1970s produced with captioning machines that were not specifically designed for the purpose. Some machines were intended for use with CCTV systems.
I vaguely remember that MSX computers were used by a few TV channels to produce scorebars and other CGI in the 1980s. Some high-end models had a genlock feature and could superimpose CGI into a video stream. I'm unsure whether any British TV channels used MSX computers but they were definitely used by indie producers in Britain.
The Commodore Amiga had impressive graphics capabilities for its time and also had genlock resulting in it being a very popular platform for CGI in the late 1980s through to the end of the 1990s. Several TV channels in Europe used them for captioning and CGI.
One change that happened was whether or not the score disappeared after a goal – presumably, in the early days
it took them several seconds to update the numbers, so they didn't do it in-vision. ISTR the first time I saw a scoreline change instantly on-screen was on a 1995 ITV game.
1994 World Cup
As mentioned in the OP, The Football Attic has some great info about some of the graphics used at past World Cups and Euros:
http://thefootballattic.blogspot.co.uk/2014/04/fifa-world-cup-in-captions-part-1.html
(1966-1978)
http://thefootballattic.blogspot.co.uk/2014/05/fifa-world-cup-in-captions-part-2.html
(1982-1994)
http://thefootballattic.blogspot.co.uk/2014/05/fifa-world-cup-in-captions-part-3.html
(1998-2010)
http://thefootballattic.blogspot.co.uk/2012/07/uefa-euros-in-captions.html
The first use of score DOGs in a major tournament was the 1994 World Cup, when ITV tried a new look for the month:

< BBC
This tournament may also have been the first use of scorebars on U.S. television, although ESPN was mainly interested in making sure the score was sponsored by someone, anyone...
Screenshots from
Biblio Foot, Cosmin Vlad and sp1873 on Youtube