Vector Imagery

[Chuck Guzis]

On 7/1/2006 at 8:26 PM Jules Richardson wrote:

>I'm thinking that something like that (though obviously not porn-based :-)

>would make a nice little self-contained display for our museum. PC +
>soundcard 
>under the desk, nice old Tek 'scope running as a little scrolling message 
>display with the museum name or something...  I don't know, it's oddball 
>enough to be quite eye-catching, but fairly trivial to implement.

EDN and Electronic Design have had several articles on how to hook up an
DAC to a parallel port--just do it twice (maybe use a spare control line
for X-Y selection) and you've got all the circuitry done.   

For example:
http://www.elecdesign.com/Articles/Print.cfm?AD=1&ArticleID=6257

If you had two parallel ports, you could save some money at the expense of
accuracy, by using a simple resistive ladder DAC:

http://www.epanorama.net/circuits/dacs.html

 The rest, as they say, is trivial software. :)

Cheers,
Chuck