18 Nov
2009
18 Nov
'09
8:40 a.m.
----------------------------------------
From: hp-fix at xs4all.nl
To: cctalk at classiccmp.org
Subject: RE: tape "load and save" to a PC/Mac
Date: Wed, 18 Nov 2009 16:49:47 +0100
---snip---
I think he means, the signal after sync mark should be in fase with the sync
mark or 180 degrees out of fase.
Did you compare the tape signals with the signals you're generating with a
scoop or may be using a spectrum analyser ?
Measuring should give you some clous about the differences between the
original and generated signals.
Is it possible that the sync mark being to long could generate a time-out..
No, I meant just what I said. Since it isn't looking for
a tone, the phase of the pulse makes a big difference.
A "plus to minus" pulse is not the same as a "minus to plus".
Try feeding an inverted signal into your serial port.
It just doesn't work. I doubt there is anything in the
toy to check for correct phase and then invert all the
pulses. It most likely expects rising edges to be rising
and not falling.
Dwight
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