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README
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1992-03-24
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This is the device dependent source for an X11R5 server for the IBM RT
and PS/2. It supports the apa16 and megapel displays on the RT and the
8514 display on the PS/2.
The files here do not need to be installed anywhere special. If you
have installed them in the X build tree, just run
imake -I<top>/config -DTOPDIR=<top>
where <top> is a relative path like ../..
The R5 apa16 code is faster than the R4 code. Text drawing is 50% faster,
scrolling is about 10% faster, and wide rectangles are 50 times faster (this
is in addition to the device independent improvements). According to x11perf,
text drawing is about 70% as fast as a monochrome DECstation 3100 (Ultrix 4.2
X server) and scrolling is a little faster.
There are bugs in the megapel server when using backing store. Turning
off backing store will not only prevent some bugs, it is also likely to
make the server faster: the megapel is slow copying images, so it is faster
for a program to redraw the screen than it is for the megapel to copy a
region from memory or the swap device.
--John Carr (jfc@athena.mit.edu)