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TT-37.001
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1993-04-23
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Tech Tip
Product: 50 MHz AMI Series 37 EZ-Flex 80486 CPU Card
Tech Tip#: TT37001
Originator: Mohan Nair
Date: March 9, 1992
Subject: Potential DMA Problems with Pre-ECN 37.002 50 MHz EZ-Flex 80486
CPU Cards
Problem
AMI customers and users may report problems with floppy reads and writes,
execution of programs from floppy disk, SCSI Controller read/writes, and other
problems related to DMA access. These problems may appear in a number of
different forms, since DMA access in EISA systems occurs in many circumstances.
Solution
First determine if the Series 37 CPU Card in question has been updated to ECN
37.002. If it has not, implement ECN 37.002.
ECN 37.002 provides a solution to this problem. It requires PAL R03F3710 in U56
instead of PAL E03F3710.