Cassette Interface Assistance

allison ajp166 at
Tue Feb 28 12:36:24 CST 2017

On 2/28/17 1:17 PM, Ethan Dicks via cctalk wrote:
> On Tue, Feb 28, 2017 at 11:21 AM, allison via cctalk
> <cctalk at> wrote:
>> On 2/28/17 10:55 AM, Jim Brain via cctalk wrote:
>>> I have a cute idea for a cassette port project for the Tandy line of
>>> computers (the ones with the cassette port)....
>> Why not just go inside and grab the signal at it source before any of the
>> analog?  it starts life at TTL waveforms (not 5V).
> It sounds like he is contemplating a battery-powered tape drive
> emulator that plugs on the outside of the machine for users to use
> without opening their boxes.  It would then be portable to other
> machines.  Sounds like a great idea.
A sound recorder, how novel.  My I phone and androids already do that.
Before that I use tape recorders.
>> Why are you trying to get to 5V in the first place?
> Digital input to the AVR.
Sounds more complicated than need be.

AVR can measure small signals using the A/D and then do a bit of looking 
for zeo crossing to
detect bit times.

> -ethan

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