Timer IC bypass... not needed?

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drac22
Posts: 7
Joined: Mon Jun 23, 2008 9:00 am

Timer IC bypass... not needed?

Post by drac22 »

So I'm still doing testing on this, but I have an atari 4 switch with the timer IC.
http://people.rit.edu/~tmm5604/personal ... 0_3834.JPG

But as you can see from the other pictures in that directory, http://people.rit.edu/~tmm5604/personal ... tari%20ic/ I built a video mod on a bread board, and it works, without reattaching the IC, or building Ben's bypass. I'm having some trouble with the color, but I can't tell if it's because I don't have the parts on hand to build a proper video mod, (I used a substitute transistor) or if this is the result of not rebuilding the timer IC.

Has anyone else tried this? I've got the parts for the bypass and a proper video mod on order, and I'll keep you guys posted on what I find.
-Drac22
drac22
Posts: 7
Joined: Mon Jun 23, 2008 9:00 am

Re: Timer IC bypass... not needed?

Post by drac22 »

So, I've been working on this some more, and so far I still haven't come to a conclusion. The next day I had some trouble with my video, and started to get a rolling picture. I chalked it up to my spare parts video circuit, but I got my parts in yesterday, rebuilt the circuit, but with the same results. :?: So then I thought maybe the timing circuit would resync the video, but even after building the timer IC bypass, I have the same results. I never fed more then 5v to the atari, so I don't think I fried anything there. Looks like more testing is needed.

-Drac22
retrodelee
Posts: 67
Joined: Sat Oct 04, 2008 6:35 pm

Re: Timer IC bypass... not needed?

Post by retrodelee »

any results of this?
I may be having a similar issue I can get gameplay... the colors are off and then they slowly progress to the right colors.

I can play for about 2 min... then it starts rolling
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