Pacman board won't boot up

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Archived from groups: rec.games.video.arcade.collecting (More info?)

The board has new ram, good roms, good synch bus and vram cards, good z80.
It does not appear to have any trashed traces or any visual damage other
than some burn marks near the edge connector.

If anyone has seen an issue like this or can give me a good starting point I
would appreciate it.

(same screen, different angles since it is hard to photograph a monitor)
http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

Since my programmer was giving me trouble last week I swapped out 5E and 5F
and now I get this
http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg

So, even though my programmer said they were fine they must have been bad.
I guess it's time for a new programmer and dump the willem POS I have.

"Jason Souza" <jsouza@verizon.net> wrote in message
news:iLRce.1923$c86.1213@trndny09...
> The board has new ram, good roms, good synch bus and vram cards, good z80.
> It does not appear to have any trashed traces or any visual damage other
> than some burn marks near the edge connector.
>
> If anyone has seen an issue like this or can give me a good starting point
> I would appreciate it.
>
> (same screen, different angles since it is hard to photograph a monitor)
> http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
> http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
> http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>
>
>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

Are you sure the 284, 285 and Z80 sockets are good?
Typically bad and can cause this type of problem.
How are the voltages on the PCB, since you mentioned
the burned edge?

Check-out the mowerman Pac-Man page, since it also
has some good info and places to check.

Scott C.

Jason Souza wrote:
> Since my programmer was giving me trouble last week I swapped out 5E and 5F
> and now I get this
> http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg
>
> So, even though my programmer said they were fine they must have been bad.
> I guess it's time for a new programmer and dump the willem POS I have.
>
> "Jason Souza" <jsouza@verizon.net> wrote in message
> news:iLRce.1923$c86.1213@trndny09...
>
>>The board has new ram, good roms, good synch bus and vram cards, good z80.
>>It does not appear to have any trashed traces or any visual damage other
>>than some burn marks near the edge connector.
>>
>>If anyone has seen an issue like this or can give me a good starting point
>>I would appreciate it.
>>
>>(same screen, different angles since it is hard to photograph a monitor)
>>http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
>>http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
>>http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>>
>>
>>
>
>
>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

I haven't replaced the sockets yet... that is next on my list.
I am not sure where to check the voltages on the pcb. Can someone give me
some test points?

thanks,
Jason

"Scott Caldwell" <lscottcaldwell@excite.com> wrote in message
news:ReSce.4436$461.1958@newssvr11.news.prodigy.com...
> Are you sure the 284, 285 and Z80 sockets are good?
> Typically bad and can cause this type of problem.
> How are the voltages on the PCB, since you mentioned
> the burned edge?
>
> Check-out the mowerman Pac-Man page, since it also
> has some good info and places to check.
>
> Scott C.
>
> Jason Souza wrote:
>> Since my programmer was giving me trouble last week I swapped out 5E and
>> 5F and now I get this
>> http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg
>>
>> So, even though my programmer said they were fine they must have been
>> bad.
>> I guess it's time for a new programmer and dump the willem POS I have.
>>
>> "Jason Souza" <jsouza@verizon.net> wrote in message
>> news:iLRce.1923$c86.1213@trndny09...
>>
>>>The board has new ram, good roms, good synch bus and vram cards, good
>>>z80.
>>>It does not appear to have any trashed traces or any visual damage other
>>>than some burn marks near the edge connector.
>>>
>>>If anyone has seen an issue like this or can give me a good starting
>>>point I would appreciate it.
>>>
>>>(same screen, different angles since it is hard to photograph a monitor)
>>>http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
>>>http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
>>>http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>>>
>>>
>>>
>>
>>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

I measure the 5 volts at the eproms and ram and it is measuring 5vdc. What
else should I check for the power?

"Jason Souza" <jsouza@verizon.net> wrote in message
news:ChSce.2740$yd1.2435@trndny01...
>I haven't replaced the sockets yet... that is next on my list.
> I am not sure where to check the voltages on the pcb. Can someone give me
> some test points?
>
> thanks,
> Jason
>
> "Scott Caldwell" <lscottcaldwell@excite.com> wrote in message
> news:ReSce.4436$461.1958@newssvr11.news.prodigy.com...
>> Are you sure the 284, 285 and Z80 sockets are good?
>> Typically bad and can cause this type of problem.
>> How are the voltages on the PCB, since you mentioned
>> the burned edge?
>>
>> Check-out the mowerman Pac-Man page, since it also
>> has some good info and places to check.
>>
>> Scott C.
>>
>> Jason Souza wrote:
>>> Since my programmer was giving me trouble last week I swapped out 5E and
>>> 5F and now I get this
>>> http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg
>>>
>>> So, even though my programmer said they were fine they must have been
>>> bad.
>>> I guess it's time for a new programmer and dump the willem POS I have.
>>>
>>> "Jason Souza" <jsouza@verizon.net> wrote in message
>>> news:iLRce.1923$c86.1213@trndny09...
>>>
>>>>The board has new ram, good roms, good synch bus and vram cards, good
>>>>z80.
>>>>It does not appear to have any trashed traces or any visual damage other
>>>>than some burn marks near the edge connector.
>>>>
>>>>If anyone has seen an issue like this or can give me a good starting
>>>>point I would appreciate it.
>>>>
>>>>(same screen, different angles since it is hard to photograph a monitor)
>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>>>>
>>>>
>>>>
>>>
>>>
>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

Check at the edge connector and the RAM. The RAM is
at the opposite end of the PCB, so if you're getting
5v there, power is probably not the issue (always
good to be sure).

Scott C.

Jason Souza wrote:
> I measure the 5 volts at the eproms and ram and it is measuring 5vdc. What
> else should I check for the power?
>
> "Jason Souza" <jsouza@verizon.net> wrote in message
> news:ChSce.2740$yd1.2435@trndny01...
>
>>I haven't replaced the sockets yet... that is next on my list.
>>I am not sure where to check the voltages on the pcb. Can someone give me
>>some test points?
>>
>>thanks,
>>Jason
>>
>>"Scott Caldwell" <lscottcaldwell@excite.com> wrote in message
>>news:ReSce.4436$461.1958@newssvr11.news.prodigy.com...
>>
>>>Are you sure the 284, 285 and Z80 sockets are good?
>>>Typically bad and can cause this type of problem.
>>>How are the voltages on the PCB, since you mentioned
>>>the burned edge?
>>>
>>>Check-out the mowerman Pac-Man page, since it also
>>>has some good info and places to check.
>>>
>>>Scott C.
>>>
>>>Jason Souza wrote:
>>>
>>>>Since my programmer was giving me trouble last week I swapped out 5E and
>>>>5F and now I get this
>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg
>>>>
>>>>So, even though my programmer said they were fine they must have been
>>>>bad.
>>>>I guess it's time for a new programmer and dump the willem POS I have.
>>>>
>>>>"Jason Souza" <jsouza@verizon.net> wrote in message
>>>>news:iLRce.1923$c86.1213@trndny09...
>>>>
>>>>
>>>>>The board has new ram, good roms, good synch bus and vram cards, good
>>>>>z80.
>>>>>It does not appear to have any trashed traces or any visual damage other
>>>>>than some burn marks near the edge connector.
>>>>>
>>>>>If anyone has seen an issue like this or can give me a good starting
>>>>>point I would appreciate it.
>>>>>
>>>>>(same screen, different angles since it is hard to photograph a monitor)
>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>
>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

All ram is measuring 4.88vdc

"Scott Caldwell" <lscottcaldwell@excite.com> wrote in message
news:bdUce.1837$m85.831@newssvr30.news.prodigy.com...
> Check at the edge connector and the RAM. The RAM is
> at the opposite end of the PCB, so if you're getting
> 5v there, power is probably not the issue (always
> good to be sure).
>
> Scott C.
>
> Jason Souza wrote:
>> I measure the 5 volts at the eproms and ram and it is measuring 5vdc.
>> What else should I check for the power?
>>
>> "Jason Souza" <jsouza@verizon.net> wrote in message
>> news:ChSce.2740$yd1.2435@trndny01...
>>
>>>I haven't replaced the sockets yet... that is next on my list.
>>>I am not sure where to check the voltages on the pcb. Can someone give
>>>me some test points?
>>>
>>>thanks,
>>>Jason
>>>
>>>"Scott Caldwell" <lscottcaldwell@excite.com> wrote in message
>>>news:ReSce.4436$461.1958@newssvr11.news.prodigy.com...
>>>
>>>>Are you sure the 284, 285 and Z80 sockets are good?
>>>>Typically bad and can cause this type of problem.
>>>>How are the voltages on the PCB, since you mentioned
>>>>the burned edge?
>>>>
>>>>Check-out the mowerman Pac-Man page, since it also
>>>>has some good info and places to check.
>>>>
>>>>Scott C.
>>>>
>>>>Jason Souza wrote:
>>>>
>>>>>Since my programmer was giving me trouble last week I swapped out 5E
>>>>>and 5F and now I get this
>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg
>>>>>
>>>>>So, even though my programmer said they were fine they must have been
>>>>>bad.
>>>>>I guess it's time for a new programmer and dump the willem POS I have.
>>>>>
>>>>>"Jason Souza" <jsouza@verizon.net> wrote in message
>>>>>news:iLRce.1923$c86.1213@trndny09...
>>>>>
>>>>>
>>>>>>The board has new ram, good roms, good synch bus and vram cards, good
>>>>>>z80.
>>>>>>It does not appear to have any trashed traces or any visual damage
>>>>>>other than some burn marks near the edge connector.
>>>>>>
>>>>>>If anyone has seen an issue like this or can give me a good starting
>>>>>>point I would appreciate it.
>>>>>>
>>>>>>(same screen, different angles since it is hard to photograph a
>>>>>>monitor)
>>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
>>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
>>>>>>http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

Make sure that all DIP switches are OFF. (If DIP switch #8 is on at
power-up, the board will not boot up!)

Verify that the socket underneath the Z-80 is good. A quick way to do this
with your ohmmeter is to "ring out" (check for continuity) the path between
each pin and is associated thru-hole located next to that edge connector
that's next to the Z-80. You'll see 40 thru-holes, two rows of 20. Each
one goes directly to its associated pin of the Z-80, so you don't even have
to turn the board over. This will let you find out if you have a flaky
socket beneath the microprocessor.

Trim off any and all long leads on the solder side of the board. This
prevents leads from getting bent over and shorting against something that
they shouldn't.

FYI: The board does not require good ROMs at locations 5E and 5F in order
to boot up. For that matter, chips don't even have to be installed in those
sockets at all. You won't get nice clean graphics, but you will be able to
tell that the board (if it's working) thinks that everything else is okay.

Here's a dumb idea, but it happened to me: I once had a STUCK reset switch!
It's that little pushbutton switch next to the audio amplifier. If it's
pushed in at power-up, the processor won't start running its program. Or it
could be stuck internally, even if the plunger is all the way out. Ring out
the switch contacts to tell for sure. It *should* be a momentary, normally
open switch. (That is, you should get continuity only when the switch is
pushed in; release, and it should go back to infinity.)

I've also had a similar problem caused by a bad 74LS161 next to the DIP
switch. That handles the main RESET pulse going to the Z-80.

Another good place for measuring +5.0 volts is across either of the 470MF,
16-volt electrolytic capacitors. Those two sit across the 5-volt power bus.
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

All great advice, Matt!

Rob


"Matt J. McCullar" <mccullar@flash.net> wrote in message
news:jMWce.2177$2f2.131@newssvr19.news.prodigy.com...
> Make sure that all DIP switches are OFF. (If DIP switch #8 is on at
> power-up, the board will not boot up!)
>
> Verify that the socket underneath the Z-80 is good. A quick way to do
> this
> with your ohmmeter is to "ring out" (check for continuity) the path
> between
> each pin and is associated thru-hole located next to that edge connector
> that's next to the Z-80. You'll see 40 thru-holes, two rows of 20. Each
> one goes directly to its associated pin of the Z-80, so you don't even
> have
> to turn the board over. This will let you find out if you have a flaky
> socket beneath the microprocessor.
>
> Trim off any and all long leads on the solder side of the board. This
> prevents leads from getting bent over and shorting against something that
> they shouldn't.
>
> FYI: The board does not require good ROMs at locations 5E and 5F in order
> to boot up. For that matter, chips don't even have to be installed in
> those
> sockets at all. You won't get nice clean graphics, but you will be able
> to
> tell that the board (if it's working) thinks that everything else is okay.
>
> Here's a dumb idea, but it happened to me: I once had a STUCK reset
> switch!
> It's that little pushbutton switch next to the audio amplifier. If it's
> pushed in at power-up, the processor won't start running its program. Or
> it
> could be stuck internally, even if the plunger is all the way out. Ring
> out
> the switch contacts to tell for sure. It *should* be a momentary,
> normally
> open switch. (That is, you should get continuity only when the switch is
> pushed in; release, and it should go back to infinity.)
>
> I've also had a similar problem caused by a bad 74LS161 next to the DIP
> switch. That handles the main RESET pulse going to the Z-80.
>
> Another good place for measuring +5.0 volts is across either of the 470MF,
> 16-volt electrolytic capacitors. Those two sit across the 5-volt power
> bus.
>
>
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

Matt J. McCullar <mccullar@flash.net> wrote:
: Make sure that all DIP switches are OFF. (If DIP switch #8 is on at
: power-up, the board will not boot up!)

But that's not his issue because enough code is running to clear the screen
of background characters :)

: Trim off any and all long leads on the solder side of the board. This
: prevents leads from getting bent over and shorting against something that
: they shouldn't.

Pacmans are notorious for that! :)


--
Mark Spaeth mspaeth@mtl.mit.edu
50 Vassar St., #38.265 mspaeth@mit.edu
Cambridge, MA 02139
(617) 452-2354 http://rgvac.978.org/~mspaeth
 
Archived from groups: rec.games.video.arcade.collecting (More info?)

Thanks for all the replies. I still can't get this board to boot. I have
tested almost every chip on the damn board and everything seems fine. Any
other ideas?

This is where I am at right now. Gets to this screen (looks like it is
going through it's startup routine) and then freezes.
http://www.souzaonline.com/temp/Issues/pacman_glitch4.jpg


"Jason Souza" <jsouza@verizon.net> wrote in message
news:iLRce.1923$c86.1213@trndny09...
> The board has new ram, good roms, good synch bus and vram cards, good z80.
> It does not appear to have any trashed traces or any visual damage other
> than some burn marks near the edge connector.
>
> If anyone has seen an issue like this or can give me a good starting point
> I would appreciate it.
>
> (same screen, different angles since it is hard to photograph a monitor)
> http://www.souzaonline.com/temp/Issues/pacman_glitch1.jpg
> http://www.souzaonline.com/temp/Issues/pacman_glitch2.jpg
> http://www.souzaonline.com/temp/Issues/pacman_glitch3.jpg
>
>
>
 
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