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1987-03-17
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XFLASH Version 1.0
by David Hite
March 17, 1987
Memory-resident FreeWare. 960 bytes required.
Usage: xflash <CR> (for the 8088 chip)
or
xflash-2 <CR> (for the 8088-2 chip)
XFLASH eliminates the flash that occurs during scrolling on the
CGA, without introducing snow. It does so by intercepting the
bios scroll up and scroll down functions, and performing these
functions itself.
It works by moving characters only during horizontal and
vertical retrace periods. It moves as many characters as
possible during these periods, and its operation is therefore
dependent on the speed of your processor. XFLASH is optimized
for the 8088 chip. XFLASH-2 is optimized for the 8088-2 chip.
XFLASH.ASM and XFLASH-2.ASM are slightly different, in that the
8088-2 can move a word during a horizontal retrace, whereas the
8088 can move only a byte.
Both ASM versions contain instructions for changing the number of
characters moved during the vertical retrace period. You may
experiment with these values in order to eliminate snow or to
speed up the scroll.
The ASM programs also contain some code to change the border
color to the same color as the fill attribute specified in the
scroll. This code is commented out in the distributed version.
If you want to set the border to the fill attribute, un-comment
this code and re-assemble.
Please report any bugs by leaving a message to me on the Computer
Connections Bulletin Board, Washington, DC. (202) 547-2008.