Epson Equity 386/20 Product Support Bulletin(s) - Page 13

Western Digital XT - GEN Hard Disk Controller Anomalies

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Product Support Bulletin Subject: Western Digital XT - GEN Hard Disk Controller Anomalies Date: Page: 8/10/89 1 of 1 PSB No: S-0089 Originator: Mm* Recent reports from the field have revealed certain anomalous behavior when the Western Digital XT- GEN hard disk controller is used in the Equity II +, Ill + or 386/20 computers. The XT - GEN controller is an 8 - bit, XT- type "generic" controller. As such, there would be an immediate loss of performance if it were installed in a 16 bit, AT- type ISA bus system. However, the poor performance is not the only issue. The XT- GEN can produce addressing conflicts that do not directly point to the controller as the cause. For example: An Equity II + was equipped with a Seagate ST- 225 hard drive and the XTGEN controller. It was also configured with the IBM 5250 terminal emulation card and software and was connected to an IBM System/36 host. Additionally, IBM's PC Support/36 software was correctly installed on both the II+ and System/36. This utility enables file and folder sharing as well as up- and download capability. The 5250 terminal emulation works perfectly; the PC Support/36 utility does not. This pointed to an "obvious" incompatibility. As part of the troubleshooting procedure, a Western Digital WD1003V- MM1 16 - bit controller was substituted for the XT- GEN. With this one change, the PC Support/36 functions started operating correctly. Other similar examples have been reported. Our recommendation is that 8- bit controllers in general should not be used because of performance losses. The XT- GEN controller should not be used at all.

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Product Support Bulletin
Subject:
Western Digital XT - GEN Hard Disk Controller Anomalies
Date:
8/10/89
Page:
1 of 1
PSB No:
S-0089
Originator:
Mm*
Recent reports from the field have revealed certain anomalous behavior when
the Western Digital XT- GEN hard disk controller is used in the Equity II +,
Ill + or 386/20 computers.
The XT - GEN controller is an 8 - bit, XT- type “generic” controller. As such,
there would be an immediate loss of performance if it were installed in a 16 -
bit, AT- type ISA bus system. However, the poor performance is not the only
issue. The XT- GEN can produce addressing conflicts that do not directly point
to the controller as the cause. For example:
An Equity II + was equipped with a Seagate ST- 225 hard drive and the XT-
GEN controller. It was also configured with the IBM 5250 terminal emulation
card and software and was connected to an IBM System/36 host. Additionally,
IBM’s PC Support/36 software was correctly installed on both the II+ and
System/36. This utility enables file and folder sharing as well as up- and
download capability. The 5250 terminal emulation works perfectly; the PC
Support/36 utility does not. This pointed to an “obvious” incompatibility.
As part of the troubleshooting procedure, a Western Digital WD1003V- MM1
16 - bit controller was substituted for the XT- GEN. With this one change, the
PC Support/36 functions started operating correctly. Other similar examples
have been reported.
Our recommendation is that 8- bit controllers in general should not be used
because of performance losses. The XT- GEN controller should not be used at
all.