Reply To: Taito F3 Arcade Board Won't Sync With OSSC; Works with Framemeister

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January 10, 2018 at 6:42 PM #18468
ShootTheCore
Participant

    I recently picked up an oscilloscope and used it to take samples of my non-OSSC-syncing F3 board in case the output differs enough from marqs’s board to be useful. As a reminder, my symptoms are:

    OSSC display: 261p, 15.44kHz, 59.18 Hz
    After pressing Info on the remote, OSSC display: VMod: 256×240 LC: 162 VSM: 2
    LED is Red with no output signal
    The same board and SCART video cable syncs perfectly with the Framemeister, but I haven’t been able to get it to work on the OSSC even with changing the inputs, power cycling, and adjusting the H-PLL Pre-coast and Post-coast to 4.

    Scope output with sync signal and red signal on the board’s gradient monitor test screen:
    https://www.dropbox.com/s/uzuscrgfzkajwje/Red2.jpg?dl=0

    Scope output with sync signal and red signal while the game is running:
    https://www.dropbox.com/s/d8cm079xeq7atu2/red.jpg?dl=0

    I’m going to try VGA instead of SCART next, but SCART sync would be preferred if it is possible.