Vector Imagery

[Don Y]

Chuck Guzis wrote:
> 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. :)

Sound card sure seems easier!  :>
Build a WAV file and just have it "play" endlessly.