Cassette Interface Assistance
Jim Brain
brain at jbrain.com
Tue Feb 28 12:39:53 CST 2017
On 2/28/2017 11:56 AM, Chuck Guzis via cctalk wrote:
> On 02/28/2017 09:42 AM, Seth Morabito via cctalk wrote:
>
>> Synertek used an LM311 (an LM358 would work just fine) to build a
>> comparator circuit. I _think_ you could use this exact circuit to
>> take the analog output from the CoCo and turn it into a 5V sqauare
>> wave.
>
> I don't know a thing about the CoCo cassette format. I know that back
> in the day when things like the KC standard were the rage, a NE567 PLL
> was considered the cat's whiskers for data recovery. But again, I don't
> know what the CoCo cassette standard looks like.
I admit my previous cassette format knowledge is Commodore based, where
they basically shoved a 5V digital signal to the cassette deck, and
expected the deck (which they produced) to handle it. Thus, interfacing
with it is a digital exercise. But, I am not picky on circuitry, so I
will take a look. Any pointers to a schematic?
>
> Also, you may want to look at the IBM 5150 (PC) cassette circuit. My
> recollection was that it was pretty robust, even if few made use of the
> facility.
I will do so. Right now, a success, even if it's not a final state
option, would be helpful. I had this great idea, but held off on it for
a few weeks because I suspected I'd end up in this state...
>
> --Chuck
--
Jim Brain
brain at jbrain.com
www.jbrain.com
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