28 Feb
2017
28 Feb
'17
10:39 a.m.
On 2/28/2017 11:56 AM, Chuck Guzis via cctalk wrote:
On 02/28/2017 09:42 AM, Seth Morabito via cctalk
wrote:
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?
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.
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