Ref: 11630003
Title: Tokenlink Cards on a Compaq 386 in a 16-Bit Bus
DATE: 8-30-89

Copyright 3Com Corporation, 1991.  All rights reserved.

On the Compaq 386/25 and Compaq 386S, there is a problem with the Compaq
motherboard.  (It appears that the Compaq 20E is not affected.)

This message comes up when MINDSETH is loaded in CONFIG.SYS:

  Initialization timed out after successful reset
      Network driver initialization of adapter failed
      This may mean wrong driver parameters unmatched driver and
      board types, a bad board, or a network failure.

Also, this message comes up when RUNMINDS is loaded in AUTOEXEC.BAT:

      Network driver initialization of adapter failed
      This may mean wrong driver parameters unmatched driver and
      board types, a bad board, or a network failure.
 *** RUNMINDS: driver 'MINDSETH' is not a MINDS driver.

These messages occur because there is a 300-nanosecond delay from the end
of DACK to the *GRAB de-assert, caused by too large a pull-up on the *GRAB
signal on the motherboard.  According to Compaq, the machine currently has an
8.2k resistor when it should be 300 ohms.  Compaq has stated they will fix
this problem by changing to a 300-ohm pull-up board, but any board currently
in the field is affected.

As a result, DMA levels 5, 6, and 7 are not functional as the Tokenlink
(3C603) card setting.  (The Interrupt level and I/O address are unrelated
to this problem.)

If you experience the problem, choose any of the following options
to work around it:

1.  Modify the motherboard with Compaq's assistance.

2.  Use only DMA levels 1 or 3 (with DMA level 3 preferred).

3.  Use a Tokenlink Plus card if the DMA settings need to be
at the higher levels of 5, 6 or 7.  (The problem does not appear
on the Tokenlink Plus card.)

Another option, to avoid using the bus master by using programmed
I/O or DMA, should NOT be chosen as it will degrade the performance
of the machine.

Make sure there are no Interrupt or I/O address conflicts between
the Tokenlink board and other cards in the machine.   3Com Tech Support
has successfully tested the Tokenlink card with the Interrupt of 10, I/O
address of 300, and DMA of 3.

