On Tue, 12 Oct 1999 22:50:56 +1700, Constant Brouerius van Nidek wrote:
> Since some days my XT has some difficulties at boot up.
> I have MS Dos 6.2 on my A drive and the rest of the programs on the harddisk
> (20 Mb). After checking the memory 512 KB OK, it normally gave the connected
> drives A: 360 B: 1400? and would than starting MS-Dos.
> Now it runs the memory check, 512 KB OK, followed by 80000 40 201.
> then the drive arrangement followed by Error (Resume ="F1" Key)
> After pressing F1, some times a normal boot is followed but some times I get
> Starting MS Dos
> PARITY CHECK I
> 80000 (S)
> Only an cold boot may help then. What is this Parity check.
> Could somebody tell me in plain english what is wrong with the system?
If you press the ram firmly into their sockets, this error might
disappear. It's possible that 640K is installed, but one chip is bad on
the highest numbered bank. You can try replacing the whole bank with a
bank from an identical XT. Parity is a way to test ram by comparing an
"extra" bit with the rest of the data bus. It is seldom used in PCs
anymore.
boB
-- Arachne V1.50;s.r.c., NON-COMMERCIAL copy, http://home.arachne.cz/
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