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From: gsisson@beowulf.ucsd.edu (Glenn Sisson)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: Hanging it at 25MHz!!
Message-ID: <gsisson.657680878@beowulf>
Date: 4 Nov 90 01:07:58 GMT
References: <1990Nov2.203728.9507@watserv1.waterloo.edu> <1990Nov3.035601.9819@world.std.com>
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>I recently purchased a clone 386-25MHz, with 1Mb (hey, only a poor student!),
>and I run into weird things with it.  When running programs I wrote in TC++
>the damn thing likes to hang on me.  This never happens at 8Mhz.
>Has anyone else ever had a problem like this?  I didn't buy a 25MHz machine to
>run it at 1/3 speed!  The dealer won't help me.  Is it a 'wait state' problem?

I have a JDR Microdevices motherboard 286 system (Neat chipset).  When
I bought it, I assumed that everything would run at the claimed 16
MHz.  What really happens (as I understand it), is that the CPU runs
at 16 MHz, and accesses motherboard memory at 16 MHz (with wait states
if you set it up that way depending on your memory chip speeds), but when
the CPU needs to use the bus (to talk to a display adapter for example), it
may run at a different speed.  On my JDR mother board there is a jumper to
control whether it runs the bus at 8 MHz or 12 MHz.  I set it for 12 and
have had no problem with slow adapter cards.

Perhaps you have such a jumper too, and you need to select a slower bus
speed when talking to adapter cards.

--- glenn "just a guess" sisson