The easiest way to check clocks is with an O'Scope. Grab a set of the
schematics, and it will list all the clocks on it. Then just check them
with a scope.
As for your Eproms reading correctly on the programmer, and them reading
correctly in the game circuit those are two different beasts. If you have
bad addressing, or bad data lines on your game board it won't matter that
the eproms read correctly on a programmer. Same goes for Ram chips. The
best way to verify is to use the fluke to read the signatures in circuit.
On Wed, Oct 30, 2013 at 8:20 AM, Grant Thienemann <
grant.thienemann@gmail.com> wrote:
> Hey Kevin,
>
> Thanks for the response. I guess I should have started out saying I
> did check the voltages, +5 is right at 5.01, +12 is 11.98, and -5 is
> -5.01 I believe, they were all basically spot on. How do I check the
> clocks? I've verified the roms are correct with my programmer.
>
> Thanks
> Grant
>
> On Wed, Oct 30, 2013 at 9:11 AM, Kevin Moore <talon.k@gmail.com> wrote:
> > Like all boards, make sure you have correct voltage going to them.
> > Then start out checking clocks, then check to make sure the roms are
> reading
> > correctly, then the ram. That's a good starting place.
> >
> > You'll also want to find a 6502 pod, sell the catbox, make a nop to use
> with
> > the 5004a with a clock divider to get atari signatures, learn how to use
> the
> > fluke 9010a Then Practice Practice Practice.
> >
> >
> >
> > On Wed, Oct 30, 2013 at 7:32 AM, Grant Thienemann
> > <grant.thienemann@gmail.com> wrote:
> >>
> >> Hey Guys,
> >>
> >> I've got a stack of Missile Command PCBs that don't work and I need
> >> some guidance on where to start. Here is what I have done with my
> >> first PCB.
> >>
> >> Checked the PCB in test mode, doesn't nothing, just an audible hum
> >> Felt all the chips to see if any are hot, none were warm to the touch
> >> Replaced all the 4116 ram with sockets and cleaned the ram legs, still
> >> nothing.
> >>
> >> I have the following equipment at my disposal though honestly, I don't
> >> know how to use some of it.
> >>
> >> HP Logic comparator
> >> HP 5004a <-- haven't used them yet
> >> Atari Catbox <-- haven't figured out how to use it correctly yet
> >> Fluke 9010a but no 6502 pod :-(
> >> Logic Probe <-- haven't used it yet
> >>
> >> Any information would be fantastic!
> >>
> >> Thanks
> >> Grant
> >>
> >>
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> >
> >
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Received on Wed Oct 30 09:26:43 2013
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