Atari 2600/7800 Composite MOD

[rubber_jonnie]

I've never taken my 2600 apart, so have no idea of how much space there is in it.

[exxos]

I thought I would post this here as I've been puzzling over this for the past few hours...

It seems the TIA chip has a different pinout for PAL & NTSC machines. This could be why when I tried my mod originally, it failed miserably as I could have been following a NTSC pinout for the TIA :roll:

It is also clear that the NTSC TIA chip also appears to have stereo audio output, and yet the PAL one does not..

TIA_PAL_NTSC.jpg

[rubber_jonnie]

Ok, they're quite a bit different :o

[rubber_jonnie]

Ok, so more info here, got the details of a mod for a 2600jr, which is a bit different.

http://blog.tynemouthsoftware.co.uk/201 ... o-mod.html

[rubber_jonnie]

Ok, so more info here, got the details of a mod for a 2600jr, which is a bit different.

http://blog.tynemouthsoftware.co.uk/201 ... o-mod.html

So, I had a crack at this over the weekend, and I've sort of got sound, but no video, however I think my cables are missing a ground somewhere along the line, as I added the cables slightly differently, so I will revisit and see if that fixes it.

Serves me right for diverting slightly and using cables instead of sockets. D'oh.

I'll report back.

EDIT: So I was right about the gound being an issue, now it's sorted, it's all working nicely. Picture is a lot better than via the modulator, though I have kept the parts in case I want to sell it on at a later date.

Need to look at the 7800 next.

[atari030]

Good stuff. I have a Jr I spannered playing with video mods a while back. Glad you did this as I needed some motivation to get on to it. I have a vader I put sockets on, wish I had used cables as I hat things that aren't reversible.

[rubber_jonnie]

Good stuff. I have a Jr I spannered playing with video mods a while back. Glad you did this as I needed some motivation to get on to it. I have a vader I put sockets on, wish I had used cables as I hat things that aren't reversible.

Cool, glad it's inspired you :)

Here's the cable with the can back on, I had to do some bending of the tin, but it's reversible.
I put a knot in the cable for strain relief, and used a small tie wrap through the old tv out holes.

JR.jpg

[atari030]

Nice work. How hard was it to get the modulator out? They tend to be soldered to pretty big grounding plates.

[exxos]

Nice :)

Do you get any "rolling" effects in the black background colour ? Also can you try pole position and take a clear screenshot ? I saw some vertical blue lines in the "sky" on mine..

[rubber_jonnie]

Nice :)

Do you get any "rolling" effects in the black background colour ? Also can you try pole position and take a clear screenshot ? I saw some vertical blue lines in the "sky" on mine..

No rolling effects, but I do get a funny ladder effect down the left hand side, but it's off to the side and doesn't affect gameplay.

Except with games that have black borders, where it isn't present.

I will get some screenshots, however I don't have Pole Position to try.