Cassette Interface Assistance

Jim Brain brain at
Tue Feb 28 12:43:17 CST 2017

On 2/28/2017 12:17 PM, Ethan Dicks via cctalk wrote:
> 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.
This year's CocoFEST is open to all TRS-80 models, not just the Coco, 
and I noticed that many of the models have a similar cassette port 
connector (I think they have variations on the format), and so I thought 
of a neat project that might be of interest to all of the participants 
of the show.

As you note, picking off 5V from inside, while entirely possible, is far 
from optimal, and a uC is the intended recipient.  Besides, as Tony 
implies, I should know this stuff, but I have indeed managed to move 
along in my efforts for so many years without needing to use a 
comparator :-)

Jim Brain
brain at

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