RE: VECTOR:Major Havoc reset problems

Jess,
    I grounded the watchdog circut on my MH board and
when I powered it up just before you could see a
picture it reset twice,5 seconds between each
reset,then it was ok.I have had no problems since,but
like I said before,it is intermitant.I played a couple
of games and had no problems.I will watch it and see
what happens.If it is the watchdog that is caysing the
problem what can I do to fix it?Thanks.
                           Jerry.

--- Jess Askey <jess@askey.org> wrote:
> This can be a tough problem to track down sometime.
> The first thing to
> do is to disable the watchdog (which is what most
> likely is resetting
> the CPU) and see what happens. There should be a
> pushtab on the board
> labeled "WDDIS", tie this to ground via a cliplead.
> The watchdog is a
> small circuit that is basically a counter. If it is
> not reset within a
> certain time period it will automatically reset the
> processor by pulling
> the /RESET line temporarily low. When the CPU is
> running properly it
> will always reset the
> Watchdog before it 'barks'. So, with the watchdog
> disabled, your CPU
> will
> Stay running no matter what problems it runs in to,
> unless it actually
> crashes and starts running garbage. You should
> disconnect your monitor
> and probably use an oscilloscope to view the vectors
> as if the CPU does
> run into a problem, you may have outputs from the
> DAC's that could
> damage the deflection circuit on the monitor.
> If the game runs fine without the watchdog, then
> you can guess that
> the problem is with the watchdog. More likely tho,
> you will find that
> the game crashes at a certain point, hence the
> resets.
>
> Good luck.
>
>
>
> -----Original Message-----
> From: owner-vectorlist@synthcom.com
> [mailto:owner-vectorlist@synthcom.com] On Behalf Of
> jerry madsen
> Sent: Tuesday, July 31, 2001 4:46 AM
> To: vectorlist@synthcom.com
> Subject: Re: VECTOR:Major Havoc reset problems
>
>
> --- jerry madsen <jetskimod@yahoo.com> wrote:
> > Hello,
> > I asked this question before and didn't get a
> response,so i'll try it again.Recently I have ran
> into
> a problem with
> > my MH board,it resets often like if you were to
> turn
> > it off and back on again(The board is working
> > perfect
> > accept for this problem),I know it is not the
> audio
> > reg board because I can put the AR board in my
> Black
> > Widow/Gravitar game and I have no problem.Dont
> think
> > it's the power supply but not to long ago I blew
> the
> > 20 amp fuse {F3} on the power supply while my MH
> > board
> > was
> > in the game(MH/Tempest conversion,Tempest
> > cabinet).Any
> > sugestions please let me know.Thanks.The problem
> is
> intermitant.
> > Jerry.
> >
> >
> >
> > __________________________________________________
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Received on Sat Aug 4 20:27:24 2001