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  1. Replies
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    1,687,567

    This shite seen the light of day yet?

    This shite seen the light of day yet?
  2. Replies
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    You need a line doubler with a VGA output....

    You need a line doubler with a VGA output.
    RGB-to-YPbPr cable (HD Retrovision) + RetroTink2x + HDMI-to-VGA converter, will be around 170$ total.
  3. Sticky: Hi Eep386, long time no talk. Yeah I don't think...

    Hi Eep386, long time no talk.
    Yeah I don't think I care that much about the differences and nuances of the very poor Genesis composite signal, since I use a full RGB setup with all my consoles.
    I...
  4. Sticky: I have received my Model 2 VA3 with 163 serial...

    I have received my Model 2 VA3 with 163 serial (china) and KA2195D encoder,
    I will compare it to my Model 2 VA4 164 serial (china) with CXA1645 encoder.

    Audio
    Recorded at 24bit 96kHz into a...
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    Looks very nice.

    Looks very nice.
  6. Is this thread dead of what? I've attached a...

    Is this thread dead of what?

    I've attached a schematic with a THS7374 amp after the BA7230LS which Syboxez posted on Discord but I have no idea if it is from Ace.
    Ace recommended on discord when...
  7. So the CSync from Pin1 of LM1881 should be...

    So the CSync from Pin1 of LM1881 should be injected directly to Y output or through a resistor?
    From what I understand the LM1881 output TTL 5v output that needs to be attenuated to consumer...
  8. Sticky: Yes. Besides the cleaner headroom of the...

    Yes.

    Besides the cleaner headroom of the Model1 and the fact that is was the original console, its 1st-order lpf sound and distorted YM2612 is overrated.
    The 3rd-order lpf of the Model 2 suits...
  9. http://www.alyjameslab.com/download.html YM2612...

    http://www.alyjameslab.com/download.html
    YM2612 Instrument Editor - Sega Genesis - Megadrive ROM

    Use this Manual to understand the functions: http://www.alyjameslab.com/alyjameslabfmdrive.html...
  10. Great write-up. I wonder if only the pull-down...

    Great write-up.

    I wonder if only the pull-down resistor and the cap will be enough to fix the "bad" models with stock opamps.
  11. Fantastic, thank you! After seeing your post I...

    Fantastic, thank you!

    After seeing your post I downloaded all my images from photobucket and deleted my account, I wanted to do it for a long time.
    What alternative you recommend?
  12. All ports of the original DN3D excreted to make...

    All ports of the original DN3D excreted to make money, the original masterpiece should be played on a PC and nowhere else.
  13. Sticky: I understand the reason behind preferring a stock...

    I understand the reason behind preferring a stock HD Model1 for having no distortion in the audio circuitry when stock, while most Model2 are distorted when stock because of an engineering flaw.
    I...
  14. Sticky: Ace, applying a 2nd-order LPF with low cutoff...

    Ace, applying a 2nd-order LPF with low cutoff frequency on a buzzy synthesizer and very-low bitrate PCM audio has a benefits of more listenable/pleasant to the ear spectrum of sound.
    The Genesis...
  15. Sticky: I guess we should wait for another user with...

    I guess we should wait for another user with stock Model2 VA0-1.8 or Model1 VA7 to test this.

    Removing the 5600p cap on the second 1st-order lpf inverting network disables the filtering and...
  16. Sticky: Eep386 can you confirm that adding a 10uF cap...

    Eep386 can you confirm that adding a 10uF cap before the 10k resistors fixed the dreaded VA0-VA1.8 distortion and makes it sound just as good as VA3-VA4?
    Is the PSG channel balanced?

    Feeding an...
  17. Sticky: Yes. Thanks for the tremendously basic...

    Yes.

    Thanks for the tremendously basic electronics lesson. :D

    By the way, do you see that VA2+ has exactly the same topology as VA0 but integrated?
  18. Sticky: 13585 Just follow the signal path, it is the...

    13585
    Just follow the signal path, it is the same as the discrete components in VA0.
    The last 27k+1800pF has the same cutoff frequency as 7.5k+5600pF.

    You can't just replace the two 10k...
  19. Sticky: I believe you're wrong there. VA2+ have exactly...

    I believe you're wrong there.
    VA2+ have exactly the same topology as VA0-VA1.8,, VA2+ has everything integrated into the 315-5684 besides the capacitors which are external.
    I can also see...
  20. Sticky: Thought this might be relevant info for this...

    Thought this might be relevant info for this thread.

    Model1:
    13578

    Model2:
    13579

    Frequency response overlayed:
    13580
  21. Replies
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    Sticky: Another good source:...

    Another good source: http://gamesx.com/wiki/doku.php?id=schematics:console_related_schematics

    Some schematics for Model1 available there.
  22. Sticky: I have run a simulation and played with it to see...

    I have run a simulation and played with it to see how each component alters the frequency response:
    13576

    Active second order low pass filtering topology (like in the Model2):...
  23. Sticky: Streets of Rage 2 - BGM 25 comparison. Here...

    Streets of Rage 2 - BGM 25 comparison.

    Here are quality recordings of Model1 VA6 and Model2 VA4 without volume adjustment between the two, just swap the cables and record.
    ...
  24. Sticky: Thanks! A few I want to add: Streets of Rage...

    Thanks!

    A few I want to add:
    Streets of Rage 2, BGM-25 (my fav), there's an instrument completely missing right at the beginning when played with YM3438.
    Aladdin, Turban Jazz & Camel Jazz, the...
  25. Sticky: Noise floor measurement is meaningless without...

    Noise floor measurement is meaningless without peak measurement.
    The right ways is to measure Noise Floor in RMS and Strongest signal in Peak then calculate the Delta in db between them ==...
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