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towmater

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Posts posted by towmater

  1. Posted

    On 2/15/2021 at 12:31 AM, jltursan said:

    So, now, is it working only feeding it with +12V?

    Uhmmmm... I couldn't find a TV with a tuner that wasn't fubar. I tried an old GameGear TV tuner, but it couldn't even sync with known good RF signals, and flatscreens seem to fly right by the Aquarius modulator signal when "auto tuning". I ordered some parts from Mouser to build a composite amp so I will know better how it faired when that arrives. I have an Oscope standing by to troubleshoot if necessary. My main concern is running the 7805 so very hot, so I ordered a buck-convertor from Amazon.

  3. Posted

    On 1/31/2021 at 8:24 AM, MackJsy said:

    (Using for example my RGB out) - however, the TEA is needed for the NTSC version, as the system clock is derived from there, the PAL version doesn't, as it comes from a seperate 7404 oscillator.

    FYI, the 6116 SRAM chips are already 5v only, there is no DRAM (4116's) that uses silly voltages in this system :)

    Not certain how to program an atf22v10, so I ordered a Sean Harrington board, which is "just" a composite amp, although it will hopefully get me to the point of verifying that the system works... the only RF tuner capable TV that I have is a 40" CRT that weighs 200lbs and hasn't left my garage floor for twenty years.

  4. Posted · Edited by towmater

    On 2/11/2021 at 12:23 AM, jltursan said:

    Check this: D1041 NPN Transistor

     

    Beware it's TO-3, a "bulky" package transistor. If it's really this transistor, you must identify it easily.

     

    It's a trap! Or a link back to this thread.

    There's a 1061 transistor that's on the far opposite side of the board from AC in. The surrounding resistor components match the numbers around the "1041" to be the culprit. I think the schematic's just wrong.

     

    I removed the -19V supply line, and the +6.6V incoming, and bypassed the +16v input, leaving only a +12V wall wart input.

     

    IMG_4718.jpg

    • Like 1

  11. Posted · Edited by towmater

    Following John Guidry's instructions... everything works but "MP", the Memo Processor. All other programs seem fine. Is there something I'm doing wrong, like not adding the diode on The G04Retro board, or doing something with the bottom pads labeled P25.2 and P25.3?

    IMG_4543 (2).jpg

  13. Posted · Edited by towmater

    29 minutes ago, arcadeshopper said:

    They are in my shop

     

    I'm starting to grok this now. The hexbus is the small connector that would lead to an external drive, and the multicart would be ideal to load Memo Processor, so it is better to have both devices? I initially thought the hexbus was the internal-ish cartridge connector.

    • Like 1

  15. Posted · Edited by towmater

    On 12/11/2020 at 12:16 PM, arcadeshopper said:

     

    https://github.com/go4retro/HEXTIr/releases/

     

     

    I would love to go into a story meeting and start taking notes on a CC40, making me king of the wonks (for a few minutes anyways, until I realize it has turned to ridicule) I gather this is not programmable in an Arduino Uno of the older style with the DIP socketed Atmega 328 chip? Also I wonder why the crystal+caps and not a simple resonator when the CC40 is slow in comparison... is that timing needed for the SD card?

  17. Posted · Edited by towmater

    WHHAATT? You've successfully implemented an SD cartridge for the CC40? While I work my way back through 27 pages, is there a Github etc. with documentation?  (It's in the first post, isn't it?) Edit - it was two posts away. I must learn the art of patience.

     

  20. Posted

    On 6/2/2020 at 11:05 AM, rcamp48 said:

    For those of you who have bought the IDE interfaces, I have been waiting 2 months now for the 3 Parallel interfaces to be modified but I am still waiting , Don is really busy and I have to remind him all of the time, it will be a little while before I can even test the prototype, as it needs a modified parallel interface. Just keeping you all up to date on this one. I have not forgotten you all.

    I dunno, it might be prudent to return the money as "Don" may not ever get around to this. I'll be happy to pay you once again if this ever sees fruition.

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