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From: LUKEN@LEHIIBM1.BITNET ("Kenneth R. van Wyk")
Newsgroups: comp.sys.zenith.z100
Subject: Re: Internal Stack Failure
Message-ID: <8710201914.AA13202@ucbvax.Berkeley.EDU>
Date: Tue, 20-Oct-87 15:06:27 EDT
Article-I.D.: ucbvax.8710201914.AA13202
Posted: Tue Oct 20 15:06:27 1987
Date-Received: Wed, 21-Oct-87 23:21:23 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 12

>
>    Has anyone seen the following message when
>    using a Zenith 158 PC:
>
>        ERROR: Internal Stack Failure
>
>    After that the system freezes.  You have to reboot.
>    Running the disk based diagnostics says that everything
>    is working fine.
>

You may want to try INFO-IBMPC...   :-) :-) ;-)