Archived from groups: rec.games.video.arcade.collecting (
More info?)
Got it up thanks to Steve. I had a Crystal Castles parts board that I stole
a 74LS02 out of and then I rigged up a test harness and had everything wired
up using spare wire and mini 'gator clips. I needed a 74LS02 to make it
happen. I'm writing up a doc file on how to convert it to JAMMA and will
post the results when I am done.
BTW: I didn't use the SENSE connections and I just plugged +12V from the
JAMMA harness into the sound board instead of the 12VAC that it really
wants. Audio is acceptable but I am probably going to test further by
adding the 12VAC.
Also, funny/oddity - I had a great picture except down the middle of the
screen - it looked like there was a 3-4" section down the center that
someone smeared. It was driving me nuts. I finally plugged in the sound
board and the bad section vanished w/o a trace.
Thanks again Steve!
--
-Steve P.
All messages are scanned with Norton Anti-Virus
"Steve Muccione" <home*DOT*muccione@verizon.net> wrote in message
news:AGKbe.3360$u56.2490@trndny09...
> bummer...
>
> hopefully someone will know the sync requirements...
>
> in any case, it's not to bad... attach power/ground to the 7402 as
> required...
>
> wire hsync/vsync into one of the inputs and the output will be the
> inverted composite... if you need to invert it again just feed it into
> one of the other gate pairs (make sure to ground the other input though,
> floating would be bad).
>
> if it's easier you can do BOTH and then feed both of the outputs to each
> side of a spdt switch and feed the middle to the monitor... this way you
> can select sync plarity as needed (might be easier to do if you have to
> disassemble lots of stuff to get access).
>
> of course, this all falls appart if Toobin used positive Hsync and
> negative Vsync or some such stupid combo... it's still doable with the
> 7402, but you'll have to invert one of the sync inputs first before
> combining.
>
> best,
>
> steve
>
> "Steve Prendergast" <stevepren-newsgroups@yahoo.com> wrote in message
> news:s6qdnQ2rsq8sivLfRVn-vQ@adelphia.com...
>> Not sure Steve. The schematics don't state (at least that I have been
>> able to find). I'll look around now for the 7402 - might as well have it
>> in case I need it.
>>
>> Funny part is that all of the other Atari boards of the era (Paperboy,
>> APB, Gauntlet) all have a clearly marked CSYNC pin on the monitor out..
>>
>>
>> Thx.
>>
>>
>> --
>> -Steve P.
>>
>> All messages are scanned with Norton Anti-Virus
>>
>> "Steve Muccione" <home*DOT*muccione@verizon.net> wrote in message
>> news:XNBbe.2103$jS6.222@trndny06...
>>> is the toobin positive or negative sync?
>>>
>>> you'll just need to combine them using a 74xx to generate the composite
>>> sync... need to know whether it's positive or negative sync to determine
>>> how to wire it up...
>>>
>>> in any case a 7402 should do the trick (quad nor gate)
>>>
>>> steve
>>>
>>> <stevenprendergast@gmail.com> wrote in message
>>> news:1114548364.239530.199100@f14g2000cwb.googlegroups.com...
>>>>
>>>> I am working on JAMMAfying TOOBIN. Question I have is that the Toobin
>>>> schematics show the monitor pinouts as VSYNC, HSYNC, VID RET. VID RET
>>>> should be VIDEO GND, right? How do I go about adding the SYNC lines to
>>>> the JAMMA harness since it wants CSYNC?
>>>>
>>>> I am aware that Toobin needs a med res monitor - I have a 29" monitor
>>>> that can handle low res (14) and med res (24), so this shouldn't be an
>>>> issue.
>>>>
>>>> Thanks!
>>>>
>>>
>>>
>>
>>
>
>
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