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<DIV>Hi all, after reading<BR><A
href="http://www.whyxo.com/2008/01/08/external-monitor-or-projector-for-the-xo/"
target=_blank>http://www.whyxo.com/2008/01/08/external-monitor-or-projector-for-the-xo/</A><BR><BR>I
am sure, that it is possible to integrate a VGA external connector for the OLPC.
On the Prototype-A motherboard layout there was such an external VGA connector,
but on G1G1 version it is gone.<BR>I am a teacher and it would be very good for
projection with a beamer or if your LCD is broken, to have such an external VGA
connector. <BR>My problem is, that I have no schematic or a good photo of both
sides of the Prototype-A motherboard. You can read in the Geode LX databook,
that the Geode LX chip offers direct VGA support and connection. But some parts
of the Prototype-A motherboard have gone in G1G1 version and so I cannot see,
which direct lines from the processor has to be used for the direct VGA support.
Pin 1,2,3 are used for the RGB signal on the G1G1 layout, and pin 13 seems to be
Hsync and pin 14 Vsync. I do not know, what is the use of pin 4,9,12,15, because
they are also wired on the G1G1 version.<BR>Pin 5, 6,7,8,10,11 are not connected
on the G1G1 version and I think, that this was the same for the Prototype-A
motherboard layout. But still there must be the lines direct to the Geode
processor from the Prototype-A layout. They only have to be found (recogniced)
via a good photo of the Prototype-A layout (both sides). Please send me your
photos and rtell me, what you think about my idea,<BR><BR>Dietmar<BR><BR>PS: RGB
lines of VGA ends on G1G1 layout direct in front of C51, C41, C86. If this is
true, only Vsync and Hsync have to be found.<BR><BR>Wikipedia says about the
pins for VGA:<BR><BR>Pin 1 RED Red video <BR>Pin 2 GREEN Green video <BR>Pin 3
BLUE Blue video <BR>Pin 4 N/C Not connected <BR>Pin 5 GND Ground (HSync) <BR>Pin
6 RED_RTN Red return <BR>Pin 7 GREEN_RTN Green return <BR>Pin 8 BLUE_RTN Blue
return <BR>Pin 9 +5 V +5 V (DDC) <BR>Pin 10 GND Ground (VSync, DDC) <BR>Pin 11
N/C Not connected <BR>Pin 12 SDA I²C data <BR>Pin 13 HSync Horizontal sync
<BR>Pin 14 VSync Vertical sync <BR>Pin 15 SCL I²C clock <BR></DIV></BODY></HTML>