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From: chan@chansw.UUCP (Jerry H. Chan)
Newsgroups: comp.unix.sysv386,comp.sys.ibm.pc.hardware
Subject: Parity error using AHA1542B
Keywords: Memory parity error ISC Unix
Message-ID: <133@chansw.UUCP>
Date: 20 Feb 91 19:46:51 GMT
Organization: Chan SmartWare Computers, Worcester, MA
Lines: 20

Anybody out there ever see a problem with parity errors while running
the Adaptec 1542B SCSI controller? We had some problems a while back
on some 386 motherboards -- systems would take a parity error during
high disk I/O activity; the fix was to use a different HD controller
(i.e., Future Domain). Now my 486 box is exhibiting the same behavior...???

Might this somehow be related to BUSON and BUSOFF parameters? I am now
using the default parameters a la ISC, and have dropped the DMA rate down
to 5mb/sec. Might the Adaptec be violating the 15 usec refresh rule on memory
during bus mastering cycles?

BTW -- No amount of memory testing seems to be able to detect bad memory.

??? Help ???

-- 
Jerry Chan 508-853-0747, Fax 508-853-2262  |"My views necessarily reflect the
Chan Smart!Ware Computer Services & Prods  | views of the Company because
Worcester, MA 01606                        | I *am* the Company." :-)
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