Re: Cassette images?

[Sir Morris <charlie_robson@hotmail.com>]

> Except that it's *not* Kansas format.  Woz chose a simple 1kHz-2kHz
> encoding that achieves an average 1500 bits/sec.  Only the zero-crossing
> times are used to discriminate the frequencies.  Two half-cycles of
> each frequency per bit, polarity unimportant.

Ahaa yes I see now. I had a quick listen to the output from ADTPro and
it
sounded quite a lot like the modified kansas style stream that I
implemented for the Arduino microcontroller. They all sound alike to
me,
these modern cassette storage systems :D

> Take a look at the monitor routines that read and write cassettes and
> you'll see what you need to do--including the short length-containing
> record that precedes the data.

I've grabbed the code for ADTPro out of CVS and had a look there.
It's been a while sinec I've enjoyed a good spellunking in 6502 caves!
20 years?
Yikes!

I managed to track down a 19 pin connector so I'll be hacking apart
a parallel lead tonight to make a duodisk cable. Hope they work! If
so they would make all this cassette malarkey redundant.

C