
For one thing, there were no graphics involved.
Characters were used for input and output with just one byte for a character. There was one font and character size on the display screen controlled by the display hardware. It's a much simpler environment.
Alex
"There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."
-- Isaac Asimov