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

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This topic contains 37 replies, has 5 voices, and was last updated by  marqs 6 months ago.

Viewing 15 posts - 16 through 30 (of 38 total)
  • Author
    Posts
  • #17061

    vasilas432
    Participant

    Great! I am confident you will fix it. My F3 boards (2 of them) didn’t have picture all though, even with maximum v sync.
    If you fix it then you can try a Capcom board with OSSC taking signal from a PVM line out.

    Thank you Marqs

    #17213

    ShootTheCore
    Participant

    Exciting news indeed! Thank you for looking into it marqs.

    #17530

    marqs
    Participant

    I checked the sync signal via scope and didn’t notice anything extraordinary besides F3 using odd-odd field signaling like many other Taito boards. As the digitizer chip in OSSC has trouble accepting such signaling via analog sync inputs, I hooked up RGB+csync from Supergun to AV3 (csync -> VGA hsync pin). Then I switched to AV3 RGBS mode and set H-PLL pre and post coast to 4, after which OSSC happily locked to the signal.

    I wonder if there are some differences between boards (or even games) as I didn’t manage to get my Framemeister to work well with F3. I had to disable framelock to get it to sync at all, but even then vertical jitter was bad enough to make any games unplayable. I recall FM getting along with odd-odd field signals with some caveats.

    #17532

    ShootTheCore
    Participant

    Huh, that’s really interesting Marqs. I’m surprised-I’ve tried three different Taito F3 boards on my setup with identical results-no sync with the OSSC, perfect effortless sync with the Framemeister. Maybe the SuperGun or SCART cable I’m using is a factor. Did you find that a sync stripper was necessary for an OSSC sync?

    #17575

    vasilas432
    Participant

    Hi marqs,
    Can you please tell the pinout of a vga male connector?
    If I understand correctly we need a cable which will be female scart—> male vga.

    #17589

    marqs
    Participant

    Yes, it’s just a passthru cable with following pinout (not including grounds which are available on many pins)

        SCART (F)                   VGA (M)
    R     pin 15                      pin 1
    G     pin 11                      pin 2
    B     pin 7                       pin 3
    S     pin 20                      pin 13
    #17600

    ShootTheCore
    Participant

    I’ll see if I can land one of those SCART to VGA cables and try the Taito F3 again. Fingers crossed…

    #17642

    vasilas432
    Participant

    I will try to just swap sync on the Extron input and output. OSSC may play RGBS via scart?

    #17670

    marqs
    Participant

    @vasilas432: I didn’t understand your question. If you can get RGB + (TTL-level) csync and feed it to VGA input on OSSC, then you should be fine.

    #17671

    vasilas432
    Participant

    I am looking for a vga cable to cut and mod it with a scart. I think I can do it. I will update when ready
    Thanks marqs

    #17673

    darkstrider2
    Participant

    @vasilas432 I had a extra 5-BNC to VGA cable to put Extron-out into the OSSC. If you were testing for sync drops, I still got sync drops.

    #17691

    vasilas432
    Participant

    @darkstrider2
    I have received a new OSSC after my first one died and I am checking for sync drops with Capcom. I will tell you what is going on in a little while.

    #17697

    vasilas432
    Participant

    I confirm that F3 is working now with OSSC like a charm! Thank you marqs
    I tested one F3 board, but more will follow

    #17705

    vasilas432
    Participant

    Three questions I have are that setting H-PLL pre and post coast to 4 or leave them to default has no difference, crystal clear image in bothe cases.

    Does everything play through the new cable via AV3 input? I tried a Capcom board and plays normaly. I didn’t try anything else.
    Is it better for the new cable to be the most part a good scart cable (with just a male VGA connector on one end) or the most part a vga cable?(very short scart cable with a female VGA connector so a usual VGA male to male cable can be connected)

    #17812

    vasilas432
    Participant

    Darius Gaiden plays perfectly with a different F3 motherboard. Bubble Memories plays perfectly as well using one of the above motherboards

    H-PLL pre and post coast need to be on 4 as Marqs said. Audio comes in from A3 and comes out through HDMI

    Thank you again Marqs. Those F3 games look awesome through OSSC to my LG OLED B7.

Viewing 15 posts - 16 through 30 (of 38 total)

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