4 Sep
2002
4 Sep
'02
2:58 p.m.
I always
thought that was called RS-422.
The Macintosh standard serial port was a RS-422 serial port. When I
went to look up what that meant, the only difference I could find was
the voltage levels.
RS-422: 0v to 5v
RS-232: -5v to 5v
There's a lot more difference than that, The
documentation I found went on to say that RS-422 was backaward
compatiable with RS-232.
The documentation is wrong.