EricDeLee's Blog

On TIA chip (bottom row of the atari) what do you have connected to pin 10?

On TIA chip (bottom row of the atari) what do you have connected to pin 10?

 

This is from here: ben heck... cutting to a 4x4

 

 

 

BUT, it's not enough. You need to attach a potentiometer that deals with the color of the unit. On your castaway Tom Hanks-esque boards, you should see this thing:

 

 

Desolder that sucker and pull it out. You'll need to reconnect it to the board.

 

Connect "A" on the potentiometer to spot "F" on the Atari board. Connect "B" to the Atari's ground. Finally, connect "C" to the UNREGULATED positive power supply.

 

Typically you'll have a power supply

with 7-9 volts coming out of it, such as a rechargeable battery

or a wall adapter. The Atari only requires 5 volts, so you use a linear regulator to drop the voltage to 5 volts. This is usually done with a 7805 linear regulator, which turns the excess voltage into heat.

 

 

 

 

Check that "E" spot as well if you can. If at all possible can you point to the part it connects to on the oppisite side of the board. I am wondering if I got that one right, as well.

ok everything looks good and the board your using pretty much looks like the one being used as an example on the benheck forums

Do you have the video mod wired up like this?

And are you getting any picture at all?

Yep. That's exactly how I have it wired up. I even rewired that part last night, because I thought perhaps that was my problem.

 

No picture at all. Nothing but noise like I am 'frying' the atari.

Actually last night I noticed I am getting something to come across. No video of the game and no noise at all of the game. When I flip the power on, I get the noise/schreeching. If I remove the audio from the av cord, the noise goes away instantly.

 

The most I can get out of this: When I turn on the system, you can tell it seems to be getting power as it changes the screen. On my TV, I have to go to INPut 2 (where I plugged the cords in) and I leave it there. Nothing works though. No video or anything.

 

I've got two theories....

 

1. Perhaps this video mod does not work for my TV? (Sharp Aquos LCD... HDTV)

2. Perhaps the top portion that I cut off is a problem.

Right next to the cart connector, if you flip the 4X4 square over to where all of the components are showing, look at the left hand side. There is a black cap (or something) and a resistor next to each other. This black cap has a trace that seems to go right above the cart connector... or below it. I'm wondering what the importance of that thing is. could it possibly connect to a pin on the cart connector? with it not being connected, perhaps it does not recieve the signal from the cart that you put in there. Not really sure. Right now that is my BIGGEST concern.

 

I may hack another board and retry everything again.

you know your probably right

its the old video mod and it only works on most tv/lcd screens

try doing the new mod video i never did the new one but im pretty sure it works on all screens

but first try it on an older tv with av input...i did the old video mod and hooked it up to a vcr and it didnt work all i got was black

 

heres a site that i think has a few video mods for the atari

http://www.cheeptech.com/2600mods/2600mods.html#themods

yep... I

'll give that a try this evening. It very well could work with my LCD screen for my project (the casio) but ould possibly just not work for my Samsung. I'll give everything another go this afternoon/evening. If that doesn't work on the other tv... I will more than likely just do a complete new board and not trim off that top part.

Some success! I have the 4x4 working.

 

Now... I can't get it it to work on my LCD. That's a toughie.

Need help on that one!