[<<Previous Entry]
[^^Up^^]
[Next Entry>>]
[Menu]
[About The Guide]
25.3 DoubleDOS
Smart multi-tasking software allocates a virtual screen buffer
for each task. Applications can then ask the multi-tasking
software where it should write and the multi-tasker handles the
screen updates. DoubleDOS 5.0, however, is using a different
method.
Every time you switch tasks from the keyboard, the screen-buffers
change. So there is no easy way for the software running under
DoubleDOS to detect this. In DoubleDOS 5.00, there are two
options that allows you to run FrontDoor under DoubleDOS just
fine. You MUST run FrontDoor in the TOP section for the two
methods below to work.
DISPLAY=TEXT If your system has a MCGA, CGA, EGA or VGA
card installed, there is extra memory
available on those cards for graphics, etc.
DoubleDOS can use some of that memory for
each of its screen buffers. To enable this,
add DISPLAY=TEXT to your DDCONFIG.SYS file.
REFRESH If you have a text-only adapter (MDA) there
is most likely no extra memory available on
the card. Add REFRESH by itself on a line to
your DDCONFIG.SYS file. This will tell
DoubleDOS to repaint the screen if the other
task is bleeding through.
X00 and DoubleDOS When using FrontDoor, X00.SYS and DoubleDOS,
do not assign the COM ports in DDCONFIG.SYS.
If you have problems with your clock, try the
DEFER option in X00.
Make sure you replace ANSI.SYS with DBLDANSI.SYS.
The BOTTOM partition should initialize before the TOP partition.
In other words, if you are loading FrontDoor in the BOTTOM
partition, try to delay the initialization of the TOP partition.
This page created by ng2html v1.05, the Norton guide to HTML conversion utility.
Written by Dave Pearson