Andrew Gaffney wrote:
> I am currently working on building my own Linux-driven Big Mouth
> Billy Bass according to the instructions at
> <http://bigmouth.here-n-there.com/>. In order to have the thing
> play the custom audio clips, I have to run patch cables from my
> audio out on my sound card to the speaker on the bass. When reading
> the following, keep in mind that this current project is my first
> run-in with low-level access to RS232, parallel, or anything
> similar.
>
> I want to be able to emulate a sound card in software so that what
> would normally come out of an audio out on a regular sound card can
> be sent through a certain pin of the parallel port without any
> hardware modifications to the computer the program is running on. I
> don't even know if the parallel port can even be accessed that
> way. Can anyone either just shoot this down now or point me in the
> right direction?
>
Well, I can't really point you to anything, but I can tell you that it
*can* be done.
It's the same principle that printer drivers are written by.
Back in the dark ages (when I was working on my AASEET), I used to do
similar things on a Commodore 64.
You will probably need extensive knowlege of the LPT interface - both
the pins and the memory addresses of the ports - and either ASM or C.
I've never learned C, so I can't really confirm that you can do it there.
I haven't done any ASM since then either. And the 8 bit 6502 is a long
way from the CPUs of today.
--
Johnny
Sistumz injunear
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