Microsoft KB Archive/64793

= Bus Speed 3C603 Token Link Card Problem w/ LAN Manager =

Article ID: 64793

Article Last Modified on 10/31/2006



This article was previously published under Q64793



SYMPTOMS
When attempting to start OS/2 or MS-DOS LAN Manager version 2.x for the first time on a Gateway 2000 (25-MHz 386, 8 MB) computer with a 3Com 3C603 Token Link card, NET STARTing the server causes the OS/2 system to hang. At this point, only a power shutdown can revive the system.



CAUSE
By default, a Gateway 2000 computer has a bus speed of 12 MHz, which must be changed to 8 MHz by setting the appropriate jumpers on the motherboard. Once the bus speed has been set to a lower value (8 MHz), the 3C603 Token Link card will work correctly, and so will OS/2 or DOS LAN Manager.

The reason the bus speed must be changed is that all ISA net cards are designed to run with a bus clock of 6 to 8.333 MHz. Therefore, a higher (or different) bus clock frequency will affect all ISA devices in an unspecified manner.

EISA devices (net cards) are designed to handle higher bus clock frequencies (up to 33 MHz).

Additional query words: 2.00 2.10 2.10a 2.20

Keywords: KB64793

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