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New Colecovision Component Mod Kit


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#1 the_crayon_king OFFLINE  

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Posted Wed Nov 16, 2016 8:05 PM

So I like to do all my own mods and there is no purchasable kit on the market so I will be making/selling them.

Will be adaptable to RGB as well.

The console I am modding atm is a "trash" console that gets teh vertical jailbars I do not believe these will show up on most consoles. \

The kit I am using is highly tweak-able so all of these issues will be in line soon enough. Just kinda stoked the kits I ordered work thought id share.

These kits will be usable for RGB, Component, S-Video, Composite amplification on MANY consoles.

 

Anywho this is what I got so far but the colors seem off:

 

FjUjOcP.jpg

YQQ59bk.jpg


Edited by the_crayon_king, Wed Nov 16, 2016 8:07 PM.


#2 the_crayon_king OFFLINE  

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Posted Thu Nov 17, 2016 9:18 AM

So update I will draw up the circuitry needed in a few hours. I would suggest using a THS7374 (or another with ability to split lines so you can get composite or S-video out as well).

I have the kit more in line with what is needed but it still missing a few components namely a capacitor to ground on the R-Y and B-Y lines and corrected resistance/capacitance values.

The luma line just needs a higher resistance pulldown resistor 5.1M ohm The R-y and B-Y lines do not need AC biased.

I could also pull correct values from C66 and C67 instead of direct from the chip. C66 C67 and L9 may be where I install these long term I just have to find their locations.

 

What is missing from the above is this circuitry:

http://i.imgur.com/NL4iFCb.png

 

Example of future kit:

http://i.imgur.com/kWVfHpc.jpg

 

Only 5 connections needed on motherboard (not pictured is ground)

http://i.imgur.com/MKmQ3eq.jpg

 

Colors still not perfect but it actually wiped out the jailbars I was getting in the video out (something the S-video mod failed to fix:

SJfXwF6.jpg


Edited by the_crayon_king, Thu Nov 17, 2016 9:28 AM.


#3 evg2000 OFFLINE  

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Posted Thu Nov 17, 2016 10:52 AM

will this work with the Expansion Modules #1, Atari adapter?   



#4 the_crayon_king OFFLINE  

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Posted Thu Nov 17, 2016 7:28 PM

I wanna say the best video you could get out of the expansion module #1 is probably S-Video but id really need a schematic of the module in question to be sure.



#5 ApolloBoy OFFLINE  

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Posted Sat Nov 19, 2016 11:24 AM

I wanna say the best video you could get out of the expansion module #1 is probably S-Video but id really need a schematic of the module in question to be sure.

It should be theoretically possible to put a 2600RGB in the Expansion Module 1 but I'm not sure if it'd fit.
 

will this work with the Expansion Modules #1, Atari adapter?

No because this mod takes the video signals directly from the ColecoVision's VDP. The best the Expansion Module can output to the ColecoVision is composite video, and in order to get any better video you'd have to mod the EM with its own video output.

Edited by ApolloBoy, Sat Nov 19, 2016 11:26 AM.


#6 Ikrananka OFFLINE  

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Posted Sat Nov 19, 2016 5:36 PM

No because this mod takes the video signals directly from the ColecoVision's VDP. The best the Expansion Module can output to the ColecoVision is composite video, and in order to get any better video you'd have to mod the EM with its own video output.

 

The Expansion Module #1 uses a clone of the 2600 TIA chip and as such it has more or less the same video output signals.  This means that in theory video mods for the 2600 should be compatible with the expansion module.  I would love to try one of the RGB mods, but for now have successfully modded one of my modules with the 2600 s-video mod sold by Electronic Sentimentalities.


Edited by Ikrananka, Sat Nov 19, 2016 5:37 PM.


#7 the_crayon_king OFFLINE  

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Posted Sun Nov 20, 2016 2:18 AM

I guess I should have specified that I meant you would probably have to mod the exp module also. For the money/effort I would just get a RGB modified Atari 2600.

For RGB out on the coleco you just need to feed the amped  signals through a LMH1251 something like this:

https://easyeda.com/...034298f7a4365d3

Very WIP and probably has alot of incorrect stuff atm. It only now has occurred to me to just use luma for sync and not bother with the lm1881 still if I made a board I would still have the option.

 

I am too busy atm to play around more for now. Anyway it looked like all the signals were compatible with my TV unamped #shrug. I would still use the amp to normalize the output but you could probably get away with some 220uf caps feeding the signals directly into the LMH1251 for RGB (or directly out to your TV for component). I just need the amp to split the signal so I can mix for composite/S-video as well.

 

Additional notes:

The video divider (in the linked schematic) would just be a THS7374 or a THS7360.

If you pull from the RF box make sure not to use the 12v power rail unless you are going to step it down with a 7805 id just pull 5v from someplace else.

C66 and C67 are under the RF modulator (I desoldered mine) you should be able to pull video off the top pins similar to the S-video mod and scratch off that one trace, id still wager that you would get better video with the RF removed. .


Edited by the_crayon_king, Sun Nov 20, 2016 2:27 AM.


#8 the_crayon_king OFFLINE  

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Posted Sat Mar 4, 2017 5:30 PM

Yea so the Colecovision supposedly puts out 1.6-3.6v.

You wouldn't want to amp that voltage without dropping it first. So the THS is there for impedance matching and line driving.

 

This should be closer to a working item. My CRT tv can apparently handle TTL levels of video but a normal TV should be expecting 2 to 1.4v (I think) which is divided with a termination resistor to 1-0.7v. The circuit below works fine with my TV but any input would be appreciated.

5EBvFyK.png

Reference is this: http://i.imgur.com/04s73pE.png

1.4v (0.7v):http://tinyurl.com/zrvx542

2v (1v): http://tinyurl.com/js8ykjo

 

So input resistor somewhere between 3-6k (assuming the voltage levels are correct)

 

 

End game is a THS7314(or 7374) and a FMS6400 in one kit that should put out Component, S-Video, and A/V

Possibly still looking into using a LMH1251 for component to RGB conversion but I don't think the LMH1251 is meant to drive video.


Edited by the_crayon_king, Sat Mar 4, 2017 6:11 PM.


#9 H454 OFFLINE  

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Posted Sat Mar 4, 2017 6:45 PM

What are you using for a sync sig in this pic:

https://i.imgur.com/kWVfHpc.jpg

Snyc on green?

 

I just got a colecovision - needs some fixing up and I'm really interested in this. I can't find a self install kit that's better than composite.

The 2600 and NES RGB mods make a huge difference and are pretty easy to install - would LOVE something for my new to me coleco.icon_wink.gif

I think their was a component kit that 5-11under made, I but I think that stopped production.

https://atariage.com...nent-video-mod/

https://atariage.com...-mod-questions/

https://atariage.com... component kit

 

I like to help to help If I can - I have Multiple RGB monitors If need you to some to help To test. 2 PVMs(one with TTL support), a Panasonic pro plasma and an xrgb3.

If you get to a workable prototype, I'd like buy one from you to test. Soldering isn't a problem(even surface mount).

My electronics experience is amateur but I'd like to help none the the less.



#10 the_crayon_king OFFLINE  

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Posted Sun Mar 5, 2017 12:48 PM

What are you using for a sync sig in this pic:

https://i.imgur.com/kWVfHpc.jpg

Snyc on green?

 

I just got a colecovision - needs some fixing up and I'm really interested in this. I can't find a self install kit that's better than composite.

The 2600 and NES RGB mods make a huge difference and are pretty easy to install - would LOVE something for my new to me coleco.icon_wink.gif

I think their was a component kit that 5-11under made, I but I think that stopped production.

https://atariage.com...nent-video-mod/

https://atariage.com...-mod-questions/

https://atariage.com... component kit

 

I like to help to help If I can - I have Multiple RGB monitors If need you to some to help To test. 2 PVMs(one with TTL support), a Panasonic pro plasma and an xrgb3.

If you get to a workable prototype, I'd like buy one from you to test. Soldering isn't a problem(even surface mount).

My electronics experience is amateur but I'd like to help none the the less.

 

I mean I can install S-Vid or composite right now using the older LM318 method. :https://easyeda.com/...ision-ug93lDxP7

I think soon I will have three different kits in order to cut down price.

One FMS6400 based kit for Composite and S-Video; https://easyeda.com/...cd29f9a2433937e

One for RGB and Component using the LMH1251 and THS7360: https://easyeda.com/...034298f7a4365d3

One for Component and CV using the THS7340:

 

For RGB Sync may be an issue atm.



#11 the_crayon_king OFFLINE  

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Posted Sun Mar 12, 2017 12:21 PM

So from testing over this weekend I realized that most newer component supporting TVs don't support the resolution of the colecovision.

Also either the sync or the luma signal was too low running through those resistors and then the amp., probably get the same/better results just using a 75ohm output resistor on every line for component assuming you have a CRT.

 

Anyway at this point I think it would be more marketable to have an RGB only kit (since most of us collectors have some type of RGB scaler laying around)

so I am going to figure that part out and post results. The lmh1251 doesn't say specifically if it supports resolutions below 240p but I think it may work.

Shouldn't be hard to have RGB, S-Video, and AV with a THS7360


Edited by the_crayon_king, Sun Mar 12, 2017 12:31 PM.


#12 ApolloBoy OFFLINE  

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Posted Sun Mar 12, 2017 12:28 PM

Anyway at this point I think it would be more marketable to have an RGB only kit (since most of us collectors have some type of RGB scaler laying around)
so I am going to figure that part out and post results. The lmh1251 doesn't say specifically if it supports resolutions below 240p but I think it may work.

Yeah I'd think you'd have a lot better luck (and a lot of interest) with an RGB board. Yurkie doesn't offer DIY kits for his RGB mod so having competition would be really nice.

#13 Ikrananka OFFLINE  

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Posted Tue Mar 14, 2017 8:41 AM

In case you're interested, I have added a new component video mod (by 5-11under) to my for sale items in the marketplace (link in my signature).



#14 Jinks OFFLINE  

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Posted Tue Mar 14, 2017 10:06 PM

Hmm this may fix colecos with bad rf modules if it only needs a good vdp?




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