Actually, I wasn't even thinking about a computer. In fact, ten or twenty years
ago there was a move toward one of these systems as a universal access tool. It
wouldn't be much more than a speech synthesizer. There used to be an outfit
called Science for the Blind which became Science Products who would add speech
output to any digital device that you had by just adding a port and supplying
you with a voice box.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html