quote] 5 seconds of speech [/quote]

you should look at this in perspective
Gorgar was the first machine to use speech, the first time I saw it even had a sign attached proclaiming ‘GORGAR, the world’s first talking pinball’

You should also know that this was before people had PCs at home (that came with the VIC 20 in 1980)
There would have been no other piece of consumer electronics that was capable of speech at that time
EDIT
After consulting Wikipedia there was a talking calculator and a machine called a Speak and spell

Video games did not get speech until 1980 (Berzerk)