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Lavalamp

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Posts posted by Lavalamp

  2. Posted

    1. It is required, because RGB signals don't contain the sync component. But it isn't the Composite Video signal. The Sophia board don't produce such signal. Your HDMI converter is safe from this. :)

    2. It is expected and safe. But if you are determined to re-fit a shield, you can cut a hole in it.

     

     

    Thanks, I actually figured it would be sync and happy to report I have successfully got beautiful RGB out from my XL very pleased, thanks Simius!

     

    Behold my Gyrus running at SCART to 1080p HDMI... :) :thumbsup:

     

    post-61762-0-66152100-1505718608_thumb.jpeg

    • Like 4

  3. Posted

     

    Hi Simius, my Sofia is installed and up and running. I have mounted the DB9 successfully in the bottom case, I do have a couple of questions:

     

    1. I'm starting the SCART cable tonight, in your wiring diagram it shows you are also passing through Composite Video. Is this required as well as the RGB? I'm concerned my HDMI converter will pick up the Composite video instead.

     

    2. When installing the Sofia it sits high with the GTIA piggy backed on it and couldn't re-fit the top shield to the XL, is this safe and expected?

  5. Posted · Edited by Lavalamp

    Now the burning question... does the 'bad' GTIA exhibit the same problem on the other machine you swapped the good one out of? There's a chance of a bad pin contact to the socket, that just reseating would help with.

     

    I had tried re-seating it first, but no go, the donor XL was in poorer shape than I was led to believe, missing its Sally and Pokey chips, and internal shield, did not want to risk my good components in it to test, so not operational. I was lucky that the GTIA and ANTIC were still there. I fitted the faulty GTIA in the donor for now.

  6. Posted

    Sophia connected to Atari SC1224 'ST' RGB Monitor

     

    Live picture 1088XEL in PAL Mode

     

    HCMxGRn.jpg

     

    This will not work from a standard Sophia board, since the SC1224 Monitor requires higher level signals than VGA (or likely other RGB monitors). The Sophia only puts out 0.75 volt RGB and CSYNC when set to RGB mode (at least my Sophia running the 'B' core did). The SC1224 requires 1 volt RGB and close to logic level CSYNC. So the first thing I did was change a resistor on the Sophia board to increase the video output from the ADV7125 Triple High-Speed Video DAC chip.

     

    Increase Video Output Level Mod (opps I see there is an extra '2' shown for the monitor part number :P )

     

    2lDYj23.png

     

     

    Next we need a buffered logic level CSYNC to substitute for Sophia's low level one, so we'll steal that from the CD4050 chip on the A8.

     

    TQVf0Nw.jpg

     

     

    And assuming all the Mods were done correctly you should now see a beautiful full color display on the SC1224 Monitor coming from your Sophia upgraded A8. And depending upon what video mode you use on your A8 (NTSC or PAL), you might need to tweak some of the back panel controls for V and H Hold, and possibly Vertical Position and Height, as well as Horizontal Position. I have only tested this on the 'JVC' version of the SC1224, so I have no idea if it'll work correctly on either the Goldstar or the Samsung models.

     

    Disclaimer: This Mod is done at your own risk, will probably violate any warranty you may have, and is not endorsed what-so-ever by Simius (creator of the Sophia board).

     

    - Michael

     

     

     

    Hi, which pin does Sofia RGB use for Audio? I assume its pint 1 looking at the plug, Do all Revs of the board use the above pin outs? I'm trying to figure out how to wire up a SCART cable for it as my board did not arrive with the cable or any docs...

  11. Posted · Edited by Lavalamp

    Guess is bad GTIA based on similar past issues with other machines but hard to be sure without further info. How does it handle something like Joust in the later levels with lots of enemies floating around on-screen at once?

     

    Heres a clearer photo of the issue, the issue starts after a number of sprites appear.

     

    File_000.jpeg

  13. Posted · Edited by Lavalamp

    Guess is bad GTIA based on similar past issues with other machines but hard to be sure without further info. How does it handle something like Joust in the later levels with lots of enemies floating around on-screen at once?

     

     

    Joust fails immediately with one following the main player, it was one of the first I tried. This also appears straight away with Zaxxon, Gyrus, Attack of the Mutant Camels, Poll Position . However Loadrunner, Hero, Defender, Gallaxian, Starquake, Rampage, ChopperLifter, Dandy all run fine. :?

  14. Posted

    Hi, I have recent purchased a 800XL (PAL) and paired it with a SIO2SD external drive, all appears to work fine, expect on a lot of games I'm getting a corrupted sprite, and I'm not sure why, would anyone be able to shed light on what may be causing this? Configuration, software, PAL/NTSC issue, RAM or Antic failure? Note that some games appear to run perfectly. Also passes memory tests fine. :(

     

    I apologize for the poor photos, but you can see the corrupted missile or sprite running vertically down the display, these will follow the player or enemies.

     

    post-61762-0-10699900-1503618939.jpg

     

    post-61762-0-24795800-1503618947.jpg

     

    Any help would be appreciated. :)

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