Could an adapter like this be used to convert a TTL level signal from the Compact Macs to a DVI LCD?

http://news.thomasnet.com/fullstory/469492

I don't know any LCDs that support less than 640x480 resolution so I would imagine there would be a black border around the 512x342 Compact Mac output?

Also, this adapter seems to work bi-directionally. Would it therefore be possible to send a TTL signal INTO a compact Mac's analogue board?