Maybe it is easier to put a simple ADC with a interrupt from it's
sync-source
going to the msx.... it should be pretty easy to make!...
> > >> You can read the ADC directly. I don't remember the port number, but it
> > >was
> > >> somewhere around 10. It produces 8-bit sample values.
> > >> The timing may be difficult, because you have to poll it at the right
> > >> frequency.
> > >
> > >The timing is the whole problem.
> >
> > What are exactly those timing issues, btw? I'm real good at synchronous
> coding.
>
> Well, this is the mainloop:
> Take 1 sample and store - wait x time - loop
>
> On the turboR, a timing interrupt is generated. On a normal MSX you will
> need to do this by putting NOPs or short loops at the place where you must
> wait. On other MSX-computers, I can time the amount of NOPs, ofcourse,
> simple calculations. But that wouldn't work on MSX-computers of differing
> speeds.
>
> Another possibility: calibrating (I do this in my SIMPL WAV player, if you
> want to know how it's done ask me), which works correct on all
> MSX-computers, but it isn't as accurate as the first method. Also, the
> calibrating needs some time, but that's not a problem because it has to be
> done only once at the start of the program (it needs about 3 secs, if you
> use a waveform for the calibrating this gives a very cool effect)...
>
> So it IS possible, but not ideal. It won't be the EXACT frequency needed,
> and besides, it is not easy to program. I'd rather prefer an interrupt or a
> bit which flips at a frequency or n Hertz.
>
> Main reason for wanting such a new cartridge is that I don't have a Philips
> MusicModule, which will cost me about 100 (Dutch) bucks, and which I would
> only use for recording. Such a cartridge as I described would be cheaper.
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