If
the sequence
of
clearing the screen and printing two directories
of
the C:
drive
is
performed with screen 1 turned
on
(it can be chosen by using the CON-
FIG program described in Chapter 3), then the screen will show the following
output.
I
,~,
XSUB
COM
A}dir
'"
C:
FILINK
COM
TERM
COM
CONFIG
C:
PIP
COM
STAT
COM
SUBMIT
COM
COM
:
XSUB
COM
A>
•
C:
FILINK
COM
TERM
COM
CONFIG .
COM
A>dir
c:
C:
PIP
COM
STAT
COM
SUBMIT
Tracking and non-tracking modes can be set with the SCRN key, and the two
virtual screens can be displayed using the
I
CTRL
I and 8 and I
CTRL
I and
EJ
keys just as with screen mode
o.
c)
Screen Mode 2 (the Dual screen mode)
In this screen mode, the real screen
is
divided into two halves. There are two
virtual screens, and each
of
the virtual screens are displayed in the two halves
of
the real screen. While the contents
of
the two screens can be seen at the same
time, they are also independent
of
one another, and so can be scrolled separately.
They canot be set in the tracking and non-tracking mode independently.
The number
of
lines
of
the two virtual screens must be in the range 8
to
48,
and must be the same in both virtual screens. The number
of
columns and the
boundary character can be set by the user. The totalnumber
of
columns must
equal 79, and there must be at least one column in one
of
the screens. The CON-
FIG program described in Chapter 3, can be used
to
set these parameters.
2-56
1
ml
columns
h
lines
1
Screen
window
1
Virtual screen 1
Conditions:
ml
+m2
=
79
h=7
8:sn:s24
n
80
columns
"I
m2
columns
Screen
window
2
t
Boundary
.....
-----
m2
columns
-------l
Virtual screen 2
d) Screen Mode 3 (the graphic screen mode)
This mode enables graphics
to
be displayed. Text can also be displayed
on
this
screen. There
is
only one virtual screen whose size
is
the same as the size
of
the real screen. Thus scrolling the real screen over the virtual screen and setting
the tracking and non-tracking modes do not apply.
2-57
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