16
The
VIC
20
User
Guide
•
CURSOR
UP/DOWN
U nshifted, the
CRSR
UP/DOWN
key causes the cursor to move down the
screen a single line. Holding down the
CRSR
UP/DOWN
key causes the
cursor
to
move down until it reaches the
bottom
of
the screen.
If
the cursor
is
on the
bottom
line
of
the screen
and
the unshifted
CRSR
UP/DOWN
is
pressed, the entire screen will be scrolled up and the cursor will be
positioned
at
the
bottom
line.
LIST your program again. Now press the
CRSR
UP/DOWN
key several
times,
or
hold it down. When the cursor reaches the
bottom
of
the screen, all
the lines on the screen will move up from one to four lines. This
is
because
the logical length
of
the lines
is
80 characters,
but
the display
is
only
22
characters wide. The logical length of a line
is
the number
of
characters the
VIC can handle internally on each numbered line. Therefore, depending on
how much
of
a line
is
left when the cursor reaches the
bottom
of
the screen
(regardless
of
what
is
actually displayed) the screen will scroll up one logical
line, producing
an
effective scroll
of
one
to
four partial lines.
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