Ref: 10490003
Title: Zenith 248 PC Problem with PCS
Date: 11/07/89

Copyright 3Com Corporation, 1991.  All rights reserved.

A Zenith 248 PC with a 3C505 (EtherLink Plus) card in a 16-bit
slot running PCS/TCP with the VEC505.SYS driver will hang,
sometimes as often as every 10 minutes.  The PC needs to be
rebooted to clear this condition.  This happens on all machines
with serial numbers beginning "86" and on some machines with
serial numbers beginning "87".

The solution is to replace a chip on the Zenith I/O board.
Replace the chip at location U309 with a chip numbered 444-471-4.

