From: Hársfalvi Levente (hlpublic_at_freestart.hu)
Date: 2005-08-18 16:34:36
Laze Ristoski wrote:
> Anyone knows what's stored in TAPs? Period or phase?
In principle, the time spent between two subsequent falling edges of the
CAS READ signal =-) . The measure is some multiples of the C64 cpu clock
(if I remember correctly). So the answer to your question is "period".
Some enhancements allow storing "half-waves" (e.g. storing the time of
each subsequent transitions). The very first transition's polarity is
fixed. ...But for C64 tap files, you can safely assume that full periods
are registered (as the C64 couldn't detect "half" periods either, due to
the (falling) edge-triggered portbit used for CAS READ).
Best regards,
Levente
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