DATMAN TECHNICAL BULLETIN #011
From: tech@datman.com
To: DATMAN user
Subject: A Hardware Interrupt Problem on AHA-2742 EISA/SCSI adapter
Date: 1995-12-29
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One DATMAN user recently reported that he identified and removed
a rare hardware-related problem that had been bothering his machine
for some time. His PC system with an HP DAT froze from time to
time while DATMAN was in action. There was no clear pattern to
the problem. Sometimes, his machine continued to work for hours.
At other times, the system crashed every few minutes during DATMAN
file transfer operations.
Note the EISA bus allows you to configure each individual slot
on the mother board to either level- or edge- trigger IRQ scheme.
His problem was completely eliminated once he switched the
interrupt triggering mechanism from the "level-trigger" method
to the "edge-trigger" method.
Both ALR, the PC manufacturer, and Adaptec, the SCSI host adapter
vendor, could not recall similar cases reported in the past.
His hardware configuration:
PC: ALR brand, EISA-bus Pentium 100 MHz
Main Memory: 48 MB
SCSI host: Adaptec AHA-2742
DAT drive: Hewlett Packard 35470A (DDS, 2 GB)
Op Sys: MS-DOS 6.22