Re: NEWSFLASH! Linux ported to Commodore VIC-20!!
Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
Mon, 14 Sep 1998 21:18:50 +0200 (CEST)
On Mon, 14 Sep 1998, Neil Conway wrote:
> Alan Cox wrote:
> > > fact, it really isn't very different from the "sound card modem"
> > > stuff (tape adds some funky failure modes that phone lines don't have,
> > > but that can probably be ignored. Of course, all error-correction has
> > > to be forward error correction, since it isn't possible to get
> > > feedback from the receiver. Hmm... if nothing else, this just might
> > > have enough hack value for someone to do it "just because".)
> >
> > At least one of the ZX spectrum emulators supports loading games from
> > tape via soundblaster
>
> Excellent ;-) IIRC, the Spectrum's input circuitry was just a
> capacitatively coupled Schmitt trigger, so that's fairly easy to copy in
> software. They probably just copied the rest from the ROM ;-)
>
> That's one of the other reasons of course that they got dreadful data
> rates; they used what was effectively a single-bit ADC to read from the
> tape...
Similar to the C-64. If you multiplied the single bit value with 15 and stored
the result in the SID volume register, you had an audio cassette player!
Greetings,
Geert
--
Geert Uytterhoeven Geert.Uytterhoeven@cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP} http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium
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