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22. Hardware incompatibility

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. (Please mail me (aeb@cwi.nl) to confirm [yes, I have the same problem], deny [no, nothing wrong with my Uni-486WB], modify [My Xyzzy machine has the same problem].)

Tjalling Tjalkens (tjalling@ei.ele.tue.nl) 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.

Some people experience sporadic lockups - sometimes associated to hard disk activity or other I/O.

Ulf Tietz (ulf@rio70.bln.sni.de) 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.'

Bill Hogan (bhogan@crl.com) 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.'


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