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Bluebook

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Posts posted by Bluebook

  2. Posted

    HI. HAVE RECENTLY CARRIED OUT AN ATARI MOD FOR COMPOSITE VIDEO USING BENS MOD AT:

    http://www.classicgaming.com/vcsp/Question1.htm

     

    I wasnt sure from the web pic (see attached) exactly where the chroma spot should be. I took a chance and wired to one end of C212.

     

    On testing games through my multistandard TV they are in B&W so am assuming I havnt got the Chroma spot right?

     

    I have a 6-switch U.S. Sunneyvale, Rev.B board.

    Have checked some other web sites, most mention the 4-switch circuitry and one mentions the 6 switch but doesnt match my capacitor and resisitor numbers on the board. Can anybody help me?

    post-6399-1108937803_thumb.jpg

  3. Posted

    Finally got the time to mod my Atari system into composite video.

    Looking around the net I noticed a few variances on how to do this...I picked this one: http://www.classicgaming.com/vcsp/Question1.htm

    I think mainly because it at least had some pics as to where you should be pointing the soldering iron and it also included two 1-k potentiometers to manually adjust if colour etc. was incorrect.

     

    Please dont have a go if I picked the wrong mod as its a bit too late now!!.... :(

     

    Sound is PERFECT - what a relief!

    Unfortunately the picture is 'rolling' (sync problem?) AND it isnt in colour when connected to my multistandard tv.

    My only 'concern' when carrying out this modification was that I wasnt entirely 100% if I had correctly located the CHROMA SPOT which apparently changes depending on what revision board you have.

    All I had was the picture from the site and it seemd to me that the CHROMA SPOT was soldered to the large capacitor near R208..was this coorect? not sure....oddly when checking to see what happens on my portable PAL only TV the pic is stable, has sound but is in B&W and the pic area is 'off to one side' causing a few vertical lines to show up on the left hand side.

     

    It was my 1st attempt at anything like this but I do like to learn... How bad have I done and can anybody help please?? many thanks

  5. Posted

    Hi. Have tried a different powersupply-no luck. Not sure what you mean by making sure TV is set to channel 3 or 4? - Signal channels available on my UK Multistandard TV is between 21 to 69 (UHF) - so does this mean its still to do with the UHF/VHF scenario? I think the TV game switch is the original but I can't be entirely sure (its a black metal box type one) - will try to get another one in case this is the problem although I still think that because my TV received UHF only this might still be the problem? :?

    PS not sure how to change the channel on the system as it just looks like an 'empty slot' - Do I need to take it apart to change selection channel? :? ..Something that might help (or maybe even confuse matters worse..) is that on my portable NON multistandard (i.e. PAL TV) I do get a picture of sorts but sound is replaced by a continuous hiss presuming it can tune in this VHF frequency....thanks for your help though

  6. Posted

    I live in England and I Purchased the above on ebay and thought I woudn't have any problems setting it up since I have a multistandard (NTSC/PAL) TV. What I failed to realise (and correct me if I'm wrong) is that this system is based upon a VHF old U.S. signal and my multistandard TV is multistandard via scart interface but can only receive UHF signals. Is there any way around this problem without having to buy an old U.S. TV? Is there any sort of RF Modulator (i.e. VHF-UHF) convertor I can buy?

     

    It also came with the game switch & the 75-300ohm adaptor that makes it fit nicely into the back of english sets as this system was intergrated with a RCA connection....unfortunately my TV fails to recognise the signal :(

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