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A/V Mod for Bally Astrocade


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#51 the_crayon_king OFFLINE  

the_crayon_king

    Chopper Commander

  • 103 posts

Posted Tue Oct 18, 2016 9:32 AM

There is a doc here for conversion to RGB:

http://www.ballyalle...rgb_convert.pdf

 

Step one I will redraw that schematic.

Also I am going to see if I can get component video out of this using a THS7314 tonight.



#52 the_crayon_king OFFLINE  

the_crayon_king

    Chopper Commander

  • 103 posts

Posted Tue Oct 18, 2016 11:14 AM

There is a doc here for conversion to RGB:

http://www.ballyalle...rgb_convert.pdf

 

Step one I will redraw that schematic.

Also I am going to see if I can get component video out of this using a THS7314 tonight.

Uh can't edit my old post here is the schematic; I think I have all the important bits:

http://i.imgur.com/2jW9Ylm.png

MOAR INFO: http://www.bucek.name/pdf/tba530.pdf

 

Any clue what kind of inductor that is ? 270N something I can't read alot of this stuff clearly.

Someone should probably check for accuracy.


Edited by the_crayon_king, Tue Oct 18, 2016 11:54 AM.


#53 the_crayon_king OFFLINE  

the_crayon_king

    Chopper Commander

  • 103 posts

Posted Thu Dec 29, 2016 10:02 PM

Here is what I am looking at: http://i.imgur.com/WLxZ12g.gif

 

Just a note for anyone looking into this (and for myself in the future). Video out should 100% be possible with a THS73XX.

I have THS7360 kits that would be good for putting out YPBBR, S-Video, or composite on this console.

 

You could use a 7805 to get +5 from that +10 and everything else can be done with the THS73XX.

 

The B-Y and R-Y look like they would need DC restore caps at the end of the THS73XX maybe pull downs on the input as well.

Y looks like its good to go but you would probably need to adjust a pull down resistor on the input for correct brightness. Or try straight in to the TV with 75 ohms for S-Video

I have no clue what the other Chroma is but it would probably also need DC restore at the output of the THS73XX.

 

I can draw up a schematic of what I would do if anyone is interested in trying to do one of the video outputs.

splitting the Luma/Sync so it can be put out to both B-y,R-y,Y and S-Video (Y|C) would be a pretty high priority. Composite too maybe.

 

 

Any measurements people have on the output values of those pins would also help greatly.

Gain of TBA530 (if I am reading this right is 40db (100x) vs 6db (4x)of the THS73XX

 

Ill design a board using the data out there on RGB using the TBA530 so people can print this and try it out if so inclined.


Edited by the_crayon_king, Thu Dec 29, 2016 10:27 PM.


#54 kenzre OFFLINE  

kenzre

    Space Invader

  • 20 posts

Posted Sat Dec 31, 2016 8:31 PM

IF you can solder, I make a comp video / pseudo stereo (both sides actually have identical outputs) board that requires soldering. The cabling is larger than the standard RF cord, so it would either be a tight fit or you might need to file the Arcade a little. The other 2 ways id can be installed is either a 3 RCA jack unit ( yellow,red,white) made for mounting to the unit, but that would require drilling 5 holes, 3 for the jacks and 2 for mounting, OR I can send it with a 35mm jack and special cable that goes from the 35mm to the 3 RCA cable.

 

The PCB, fully assembled and tested with the 3 RCA in one is $50.00. comes with mounting instructions, wiring to go to the unit and jack.

The 35mm jack version is $75.00 because it has the extra cable.

A 6 foot 3 wire RCA AV cable (YRW connectors both sides) can be used by either... $15.00 

Shipping, Processing and handling fee of $15.00 required if shipped in US.

 

Requires that the modulator box has to be placed back on it's jack to get a color output. Without it, you will get a B/W output.



#55 the_crayon_king OFFLINE  

the_crayon_king

    Chopper Commander

  • 103 posts

Posted Sun Jan 1, 2017 8:19 AM

IF you can solder, I make a comp video / pseudo stereo (both sides actually have identical outputs) board that requires soldering. The cabling is larger than the standard RF cord, so it would either be a tight fit or you might need to file the Arcade a little. The other 2 ways id can be installed is either a 3 RCA jack unit ( yellow,red,white) made for mounting to the unit, but that would require drilling 5 holes, 3 for the jacks and 2 for mounting, OR I can send it with a 35mm jack and special cable that goes from the 35mm to the 3 RCA cable.

 

The PCB, fully assembled and tested with the 3 RCA in one is $50.00. comes with mounting instructions, wiring to go to the unit and jack.

The 35mm jack version is $75.00 because it has the extra cable.

A 6 foot 3 wire RCA AV cable (YRW connectors both sides) can be used by either... $15.00 

Shipping, Processing and handling fee of $15.00 required if shipped in US.

 

Requires that the modulator box has to be placed back on it's jack to get a color output. Without it, you will get a B/W output.

 

You should at least try using the FMS6400 that way you could get S-Video and composite.

I made this open source may help if you ever wanna go that route: https://easyeda.com/...7a9acbcaf2880c9


Edited by the_crayon_king, Sun Jan 1, 2017 8:21 AM.





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