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Advanced BIOS Functions
CMD# 4 - Roll Up Screen
This command enables the programmer to roll up the specified number of lines on
the screen, as shown in Figure 6-6. The function uses only the display request block
fields listed below. The contents of the remainder of the area are ignored.
CMD#
LA
4
Number of lines to roll up
If the number of lines to roll up exceeds the number of lines that
have been written, the next line is erased.
YJ[)IO
""1.l\10R~
OlD
ROil 1'1'
_
_ 6
- - - - -
27
50
_ _ _ _ _ _
-4---'---'---'--' ............
~
'" I \\
Figure 6-6 Roll Up Screen
6-25
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