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Type: Posts; User: l_oliveira

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  1. Replies
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    Here, slightly offtopic buy playing megadrive...

    Here, slightly offtopic buy playing megadrive VGMs on a high end MSX computer:

    fYRptH5zffI

    The MSX computer is doing actual PCM related processing (stream playback) on it's own and using it's...
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    Actually, Silpheed is the best test for the CD...

    Actually, Silpheed is the best test for the CD drive on a MEGA/SEGA-CD unit. If the drive is bad or misaligned you won't be able to play even if the disc is perfectly fine.
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    Yes, the drive can be replaced wholly. With CD2...

    Yes, the drive can be replaced wholly. With CD2 units there's a different BIOS version for units with a single board (FUNAI board/NEC CDC MEGA-CD/SEGA-CD) which doesn't work with the two boards...
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    Maybe, if you don't mod the 47K resistors. @OP,...

    Maybe, if you don't mod the 47K resistors. @OP, btw the official leaked VA3 schematics mention the capacitors being 2700P not 4700P.

    Edit: Ops actually I saw 2700p but it's for a nearby...
  5. For one thing I just figured out that the...

    For one thing I just figured out that the processing noise and interference in the original Mega Drive audio are part of the experience. I no longer want them gone.

    Even the video quality, I don't...
  6. Maybe because it's a YM3438 in there. That one...

    Maybe because it's a YM3438 in there. That one has some different behaviors on the readable registers, even though the custom one there has some changes to make it behave more like a YM2612 for...
  7. You guys scratching head to a software problem....

    You guys scratching head to a software problem. The FM chip will produce continuous sound if a tone has no decay rate set, until a KEY-OFF command is written for that specific voice.
  8. Replies
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    I did this just yesterday to a VA0 megadrive and...

    I did this just yesterday to a VA0 megadrive and now it behaves about the same as a stock VA3. But I copied it from a Japanese VA6 I had lying here. Everything looked identical besides these two...
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    That's a model 1 MEGA-CD/SEGA-CD with the...

    That's a model 1 MEGA-CD/SEGA-CD with the uncommon JVC drive. That's a JVC OPTIMA-5 optical pickup which unfortunately is a tad expensive, like 60 bucks a pop...

    The SONY KSS-240A is more like 25...
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    That pin is what actually touches the sensor...

    That pin is what actually touches the sensor switch which tell the CDC chip (CD drive CPU) that the tray finished opening. It's removable because when servicing, if one need to remove the tray it...
  11. The Fujitsu encoder is excellent for applications...

    The Fujitsu encoder is excellent for applications you want big noise immunity. That's why they preferred to mound CDX units with those. The CDX is very cramped and on such configurations it is hard...
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    PS1 feeds the CXA1645 a triangle waveform (no, it...

    PS1 feeds the CXA1645 a triangle waveform (no, it doesn't use attenuation with a RC circuit like the CXA1645 datasheet suggests, it uses a real triangle waveform output by the graphics chip) to it's...
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    If you're feeling crafty, you can try building...

    If you're feeling crafty, you can try building one of those:

    https://web.archive.org/web/20031004001604/http://www.pantsofevilgamers.com/kb/default.htm

    The files are no longer available and are...
  14. Silpheed is particularly finicky because it uses...

    Silpheed is particularly finicky because it uses FMV for the animated backgrounds. It's a proprietary, compressed algorithm in which a error on part of the video data would cause errors to propagate...
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    Well, I gotta comment that the CD1 has a small...

    Well, I gotta comment that the CD1 has a small heatsink but the IC it uses for 5V conversion is slightly better in efficiency department than the plain 7805 IC.

    I would avoid using a prototype...
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    Poll: The 32X shouldn't exist... But it does and I...

    The 32X shouldn't exist... But it does and I finally got one... lol
  17. Replies
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    That unit looks like a prototype for the Funai...

    That unit looks like a prototype for the Funai manufactured MEGA/SEGA-CD unit.

    CDD is the microcontroller chip which drives the CD drive. It's a 4 bit CPU with a embedded ROM program which...
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    That was a interesting exercise which proves how...

    That was a interesting exercise which proves how messy SEGA was with their hardware/software development.

    But we love them anyway, don't we?
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    And it leaves an annoying faint background...

    And it leaves an annoying faint background whistle/white noise which can be very annoying when it's not producing any sound.

    Very bad design choice IMHO.
  20. Hint for people with 32x units having random issues.

    Hello guys. I have recently received two VA1 32X units where one were faulty and the other were working correctly. Upon repairing the faulty unit (I did reflow the solders for all chips on the main...
  21. On the original arcade game Gaum-Hermer says...

    On the original arcade game Gaum-Hermer says "Welcome to your doooma" before transforming and you dared to cut the end of the sample... That makes me sad...

    It's like changing what a politician...
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    Open it and clean the button itself. Then clean...

    Open it and clean the button itself. Then clean the insides of the case where the button is housed in. Likely dust is jammed in there and is sticking the button to the casing.
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    Awesome

    Awesome
  24. Replies
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    Yes, for "educational purposes". Actually it's...

    Yes, for "educational purposes". Actually it's interesting see the changes made from a revision to another.
  25. Replies
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    Here's mine:...

    Here's mine:
    https://lh3.googleusercontent.com/-wdrQbPueA0U/VriZxtDrOsI/AAAAAAAAJWQ/gN2z6NhOtto/s800-Ic42/DSC02849.JPG
    11182

    Your sticker claims it to be the "B" revision, which is listed here:...
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