Cassette Interface Assistance

allison ajp166 at
Tue Feb 28 12:51:26 CST 2017

On 2/28/17 1:43 PM, Jim Brain via cctalk wrote:
> 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.
The TRS-80 used two formats!  THe base 4K with 4K basic was a slower 
format than the 12K basic machine.
The MM100 was a modem (bell 103 compatable).
The pocket computer was again different I forget the format.
COCOs I think were not all the same.

Lots of ground to cover.

> 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 :-)

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