Interesting project, *mmmh if I had more time a day!*
You can fool older VGA monitors by setting pins to ground, like angrydroid mentioned.
Monitor ID detection pin assignments
4 11 12 (Pin)
ID2 ID0 ID1 (Description)
n/c n/c n/c no monitor
n/c n/c GND Mono monitor which does not sopport 1024x768
n/c GND n/c Color monitor which does not support 1024x768
GND GND n/c Color monitor which supports 1024x768
GND menas connected to ground
n/c means that the pin has not bee connected anywhere
... tying pin 12 to GND should do it.
But newer monitors use other more complex protocolls (I2C serial bus), to emulate/fool that you need
an microcontroller. So I would use an old monitor not a LCD monitor
I am not shure if it is enough to fool the "monitor presence detection". The synchronisation (H/V Sync) has
to be correct, too. So a little circuit is needed to generate the sync signals.
check this out.... Composite tio RGB converter for example
http://elm-chan.org/works/sc/report.htmlhttp://www.epanorama.net/links/videocircuits.htmlhttp://www.epanorama.net/documents/pc/vga_timing.htmlTwo little NE555 (or one NE556) oscillator on the sync pins.
H-Sync (pin 13) 31,5 kHz
V-Sync (pin 14) 60 Hz
but one of the sync signals has to be a negative voltage!
see
http://lslwww.epfl.ch/pages/teaching/cours_lsl/ca_es/VGA.pdfBut I could be wrong of course, maybe grounding pin 12 does it perfect.