AT&T 6300 Programmer's Manual page 503

WIDTH
Statement
The following summarizes all possible cases.
0
40 select a 40-column screen
(text)
80 select an 80-column screen
80
place the system in high-
resolution (mode 2)
1 40 create a test window of width
(medium-res)
40
80
forces the screen into high
resolution
2
40 create a text window of width
(high-res)
40
80
create a text window of width
80
100 40 create a text window of width
(super-res)
40
80 create a text window of width
80
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