Vector Imagery

[Jules Richardson]

Don Y wrote:
>> 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.

Although I wonder if the parallel port's fast enough such that a couple of 
latches could be used upstream of the dacs, controlled by one of the parallel 
port's status lines? That way only one port could be used, plus there's scope 
for using another of the status lines to control blanking.

cheers

Jules