Re: Re: Asteroids rapair saga

If that's what the manual states, then the manual is wrong! The number of beeps indicate the bad RAM although there may be some address decoding or buffer issue causing the same symptoms. The only time there will be six beeps is when the ram test thinks P4 is bad.

The stuck address lines don't sound that good but I really don't know for sure. It could validly be in the RAM address range - which address lines are high / low? Is the socket for the vector ROM good? Try checking on the underside of the board for activity on those lines.

Sorry, that's all I can think of without schematics to hand!

>
> From: "MyPearl" <mypearl@dds.nl>
> Date: Mon 19/May/2003 16:03 GMT
> To: <vectorlist@synthcom.com>
> Subject: Re: VECTOR: Asteroids rapair saga
>
> So, your saying that the beeps count until the bad RAM is found - in the
> order you've given. The manual says it should always give you 6 beeps, but
> for the bad part the beep sound is much lower. Is that not correct?
>
> I have rplaced all the RAMS's for know good ones - no change.
>
> When I peek around the address lines of the vector ROM, they aren't all
> alive, some are stuck either high or low. I suspect this is not normal, even
> in test mode, Am I correct?
>
> Many thanks for your reply!
>
> Mendel
> ----- Original Message -----
> From: <steve@coule.freeserve.co.uk>
> To: <vectorlist@synthcom.com>
> Cc: <mypearl@dds.nl>
> Sent: Monday, May 19, 2003 5:01 PM
> Subject: Re: VECTOR: Asteroids rapair saga
>
>
> > It's most likely a dead 2114 ram at E2. You don't get six beeps unless
> it's P4 that's dead - the beeps stop when the first bad ram is detected.
> >
> > 1 beep = D2
> > 2 = E4
> > 3 = M4
> > 4 = R4
> > 5 = N4
> > 6 = P4
> >
> > Steve
> >
> > >
> > > From: "MyPearl" <mypearl@dds.nl>
> > > Date: Mon 19/May/2003 11:59 GMT
> > > To: <vectorlist@synthcom.com>
> > > Subject: VECTOR: Asteroids rapair saga
> > >
> > > Hello group,
> > >
> > > I've been working on my project Asteroids for a few weeks now, and I
> could
> > > use a little help with it now. :)
> > >
> > > The board (rev 4) was completely dead, watchdog resets were constantly
> > > happening. That was fixed by installing a new CPU and ROM at D/E1. To be
> > > safe, I replaced the 245 buffer as well.
> > >
> > > A tip in the 'Asteroids repair enceclopedia' suggested to disconnect the
> > > /DMAGO signal by desoldering LS43 at L6 and lifting pin 1.
> > >
> > > Now the board does run, no more watchdog resets. In test mode, I can see
> two
> > > beeps passing along on my scope (I have the board running at my bench
> off a
> > > single 5V power supply). Not the sequence of six beeps, as described in
> the
> > > manual.
> > >
> > > I don't really know where to look further, so any help would be GREATLY
> > > appreciated!
> > >
> > > Cheers,
> > >
> > > Mendel
> > >
> > >
> >
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Received on Mon May 19 09:38:18 2003