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<H2><A NAME="s22">22. Hardware incompatibility</A></H2>

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<P>Several people have noticed that they lose typed characters when
a floppy disk is active. It seems that this might be a problem with
Uni-486WB motherboards.
<P>Tjalling Tjalkens (<CODE>tjalling@ei.ele.tue.nl</CODE>) reports very similar problems
with "a no-brand GMB-486 UNP Vesa motherboard with AMD 486DX2-66 CPU" -
during floppy activity some keystrokes are lost, during floppy tape streamer
(Conner C 250 MQ) activity many keystrokes are lost.
<P>Some people experience sporadic lockups - sometimes associated to
hard disk activity or other I/O.
<P>Ulf Tietz (<CODE>ulf@rio70.bln.sni.de</CODE>) wrote:
`I have had the same problems, when I had my motherboard tuned too fast.
So I reset all the timings ( CLK, wait statements etc ) to more 
conventional values, and the problems are gone.'
<P>Bill Hogan (<CODE>bhogan@crl.com</CODE>) wrote:
`If you have an AMI BIOS, you might try setting the Gate A20 emulation
parameter to "chipset" (if you have that option). Whenever I have had
that parameter set to any of the other options on my machine
("fast", "both", "disabled") I have had frequent keyboard lockups.'
<P>There may be a relation between keyboard problems and the video card in use.
<P>Shawn K. Quinn (<CODE>skquinn@wt.net</CODE>) wrote:
`I have a Zeos Pantera Pentium-90 that originally came with a Diamond Stealth
64 S3-based video card. Under X I frequently got q's inserted into my text
(how annoying) especially if I typed very fast (during Netrek for instance,
even more annoying because guess what that does :-( ).
Switching to a Creative Labs Graphics Blaster MA202 solved the problem.
I'm assuming the Stealth 64 did something funny with the timings.'
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