RE: Green screen to GUI

Windows 1.0: 1985.
AS/400: 1988.

Legacy platform: Windows.
Major difference: The iSeries can still run that code from '88.


Now, you might argue the 400 is really a grown up System/38, which came
out in '78.  That's fine, but Windows grew from MS-DOS which was a
re-badged version of QDOS (1980) which itself was an adaptation of CP/M,
which was released in '74.  Funny how even in it's infancy Microsoft
wasn't innovating but instead relied on acquisitions to gain their
technology.

Legacy platform: Windows / DOS / CP/M if you count the CP/M influence;
S/38 if you don't.
Major difference: The iSeries can still run that code from the S/38.


Of course, you can add that Unix was released in 1969, making it older
than both. :)