29 May
2016
29 May
'16
1:12 p.m.
2016-05-29 20:34 GMT+02:00 Mark J. Blair <nf6x at nf6x.net>:
My first attempt to use silicone tubing to repair my
TU58 rollers was also
unsuccessful. Maybe the material I used is too soft? Your experience
suggests to me that I should hook up an oscilloscope to measure bit timing,
and then adjust the roller composition and diameter to arrive close to the
correct bit length.
It might be too soft. But the capstan doesn't look to flat when the tape is
inserted. So I am not sure. Pin 5 on the 8085 has the read data and pin 7
is the strobe data.
Another question is how sensitive it is to speed variations. Apparently it
is. Or my tapes are bad. But I cannot tell for sure since I have no working
reference.
The encoding scheme is rather simple. And decoding is done by some analogue
electronics doing integration. Since it is a fixed capacitor value used it
can be problematic.
/Mattis
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/