Does ISC Unix detect parity?

[Paul]

I have a friend who has been running ISC Unix at home for some time
now without any problems.  He has just installed SCO XENIX 2.2.3
on his machine and now he has been getting 'memory parity error'
messages.  He never got this error message with ISC.  What's going
on here?

His machine is a no-name 386 with 4 megabytes of memory, I ran a
DOS diagnostic but it didn't show any errors.

Please send me responses via e-mail.  If there is sufficient
interest, I'll summarize for the net.

Thanks in advance.