IBM PC "VGA" and "SVGA" video card/connector info




Connector: 15 pin sub-mini  "D" connector

   Signal Name    Pin Number   Notes
   -----------------------------------------------------------------------
RED video          1        Analog signal, usually 0.7 volt, peak-to-peak
GREEN video        2        Analog signal, usually 0.7 volt, peak-to-peak
BLUE video         3        Analog signal, usually 0.7 volt, peak-to-peak
Monitor ID #2      4        (see note)
Digital Ground     5        General "Ground" for the video system
RED ground         6  \     Note that the video signals have a separate
GREEN ground       7  |      ground path.  This is needed any time you
BLUE ground        8  /      get the pixel rate much over 20 or 30 Mhz
                                which is just about always.
KEY                9        (Not used)
SYNC ground       10        TTL return for the SYNC lines.
Monitor ID #0     11        (see note)
Monitor ID #1     12        (see note)
Horizontal Sync   13        Digital levels (0 to 5 volts, TTL output)
Vertical Sync     14        Digital levels (0 to 5 volts, TTL output)
Not Connected     15        (Not used)


The signal levels in RED, GREEN and BLUE are 0.7V peak-to-peak video signals terminated
to a 75 ohm load in the video card and monitor ends.  All other signals are TTL level signals
      (around 0..0.7V means logic 0 and 3..5V means logic 1).

/[ Note1 ]/  Used by video cards to determine the type of monitor connected to the graphics card
{ Multi-Frequency  or  Multi-Sync }  and, the range of frequencies the monitor is able to handle.
On most types today, these signals are used as Plug-N-Play monitor signals.


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© 2001 MCP-Logics



  

  

    
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      updated Nov-28-2001 
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