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Bitbang VGA from an SD card slot

Posted on Monday, May 9th, 2011 in hacks by the machinegeek

The Ben NanoNote is a cheap netbook without VGA video output. This hack connects a VGA cable to the SD card slot and uses software to bitbang a VGA signal.

This hack is accomplished using the Universal Breakout Board (UBB) which slides into the SD slot providing access to these signals. The UBB interfaces with the VGA connector via a handful of resistors. The schematic and code for the Ben are posted on the project’s site.

Thanks Kelvin! Via the contact form, originally Slashdot.

 

This entry was posted on Monday, May 9th, 2011 at 3:13 pm and is filed under hacks. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

One Response to “Bitbang VGA from an SD card slot”

  1. David says:

    Nope, it’s more than bitbanging. While the first implementation [1] used bit-banging to get some low-resolution (sub-QVGA) mode with 8 colors, the newer version [2] has the SDIO controller output blocks of (line-)data to the 4 MMC data-lines. Also that version features 16 colors by using resistors to implement the standard 16-color VGA palette.

    [1] http://lists.en.qi-hardware.com/pipermail/discussion/2011-April/007817.html
    [2] http://lists.en.qi-hardware.com/pipermail/discussion/2011-April/007878.html

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