From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2005-08-16 19:57:11
On Tue, Aug 16, 2005 at 07:07:38PM +0200, Laze Ristoski wrote:
> Loaders usually (probably always) work with equal phases.
The built-in loader of the Oric-1 works with pulses, not with cycles.
That loader is immune to the polarity of the signal. For some reason,
in my experience some Commodore machines (maybe even the 64) are picky
about signal polarity. I didn't figure out why; I just wanted to make
the C2N232 work.
Also, some fastloaders on the plus/4 work with pulses. What you say
may be true on the Commodore 64, which cannot detect a rising edge
of the CASS READ signal.
> > Your chances of gaining any scientific understanding of what is
> > going on are
> > next to impossible with this method. Digitizing the tape into a WAV adds
> > quantization errors which will end up looking like noise.) A spectrum
> > analyzer or oscilloscope would be the only useful way to analyze this.
>
> Unfortunately I don't have access to such devices.
Some audio editors can show the signal in the frequency domain. I
wonder if the quantization errors are significant when sampling at
48 kHz or more, 16 bits per sample.
Marko
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