[Coco] Coco Cassette interface help

[Dave Philipsen]

Are you primarily looking for information on how to deal with the analog signals and convert them between digital and analog or how to encode/decode?  It's basically a form of Frequency Shift Keying that is well described in the CoCo Tech Manual on page 32.  I can get you a copy of that page if you don't have it.

The best way to deal with this type of data is to detect zero crossings and their timings.  The fact that a DAC is used in the CoCo to create these signals is merely to facilitate their analog recording to tape.  Otherwise, you can just consider them as square waves.


Dave Philipsen

> On Feb 26, 2017, at 10:47 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> 
> I am trying to interface an Atmel AVR with the Coco cassette port, and before I get too far into the design, I am wondering if there are any existing Coco to uC via Cassette Port projects out there I can borrow ideas from?
> 
> Looking at the scope, it looks like I need to amplify the signals from 1.2ish V before I can do much, and thought I'd see if tehre is existing circuits out there to use.
> 
> Jim
> 
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