On 3/1/2017 11:56 AM, dwight via cctalk wrote:
I'm not sure how something as simple as a cassette interface could be causing
so much issues.
Can you post a schematic of what you have now and what the signal amplitude is?
Hmm, It's currently a jumble of wires and clips and such on the bench.
I
2017 3:10:50 AM
To: cctalk@classiccmp.org
Subject: Re: Cassette Interface Assistance
On 03/01/2017 01:40 AM, Jim Brain via cctalk wrote:
> On 2/28/2017 2:34 PM, Brent Hilpert wrote:
snippage
> Obviously, given the LM339 issues, this is unworkable in the end, but
> it did get me to realizin
On 03/01/2017 01:40 AM, Jim Brain via cctalk wrote:
> On 2/28/2017 2:34 PM, Brent Hilpert wrote:
snippage
> Obviously, given the LM339 issues, this is unworkable in the end, but
> it did get me to realizing some outputs on the LM339, so thanks to
> both of you.
>
> I can plainly see the oscillation
On 2/28/2017 2:34 PM, Brent Hilpert wrote:
In answer to the final point, and the interests of some analog education,
looking at your reffed pdf, page 75, the reason (or one reason)
your duplicated Coco input circuit is not working is the gross impedance
mismatch between the coco tape output and
> From: Tony Duell
> I fail to see how anyone can be a good digital designer and not
> understand analogue electronics.
It's easy! As long as your devices are being run in a domain where their
behaviour is purely, well, digital, one can get away with it! :-)
I'm a perfect case in poi
if anyone has a cable for the trs 80 model 100 small compact cassette drive to
the 100 please lest us know. need this for demoing and display of the model 100
in the museum...
thanks ed# www.smecc.org
Sent from AOL Mobile Mail
On Tuesday, February 28, 2017 allison via cctalk wrote:
On 2/28/1
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
On 2017-Feb-28, at 7:55 AM, Jim Brain via cctalk wrote:
> Analog, which is my nemesis, curses me again.
>
> I have a cute idea for a cassette port project for the Tandy line of
> computers (the ones with the cassette port). I have a Coco 3 on the bench,
> so I scoped the output line while doing
It was thus said that the Great Tony Duell via cctalk once stated:
> On Tue, Feb 28, 2017 at 4:21 PM, allison via cctalk
> wrote:
>
>
> >
> > The tape recorders used had no agc. They were simple portables and used the
> > mic or line input and headphone output.
>
> I have to disagree with you
On Tue, 28 Feb 2017, Jim Brain via cctalk wrote:
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
yes. even the IBM PC 5150 uses the same connector and pinout, and cable
(Radio Shack #26-1207)
On Tue, Feb 28, 2017 at 4:21 PM, allison via cctalk
wrote:
>
> The tape recorders used had no agc. They were simple portables and used the
> mic or line input and headphone output.
I have to disagree with you there. I have just looked at the documentation for a
couple of the Radio Shack tape r
On Tue, Feb 28, 2017 at 6:10 PM, Jim Brain wrote:
> A digital one. The current goal is to feed the incoming data stream into an
> Atmel AVR running at 5V for parsing. The final goal is to do the same, but
> run the AVR at 3V on two coin cells.
OK. I assume you don't want to be running special
On 2/28/2017 12:36 PM, allison via cctalk wrote:
A sound recorder, how novel. My I phone and androids already do that.
Before that I use tape recorders.
Using a classic machine, how novel. My iPhone and androids already
compute everything I need. Before that I used other machines still more
On 2/28/2017 11:42 AM, Seth Morabito via cctalk wrote:
Hi Jim,
When I was building a cassette circuit for my homebrew 6502 computer,
I essentially stole the Synertek SYM-1 circuit wholesale. See:
http://www.loomcom.com/blog/2013/01/04/retrochallenge-update-comparator-vs-zero-crossing-detector/
On 2/28/17 12:56 PM, 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
On 2/28/17 1:17 PM, Ethan Dicks via cctalk wrote:
On Tue, Feb 28, 2017 at 11:21 AM, allison via cctalk
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
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
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
On Tue, Feb 28, 2017 at 11:21 AM, allison via cctalk
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 bef
On 2/28/17 12:09 PM, Paul Berger via cctalk wrote:
74LS of 74HC gates are not going to work, the signal level is only 1V
the threshold for 74LS is 2V and for 74HC it is 3.7V. I would
probably use something like a compatator or an opamp but I don't have
a circuit handy to use, but tehy should b
On 2/28/17 10:55 AM, Jim Brain via cctalk wrote:
Analog, which is my nemesis, curses me again.
I have a cute idea for a cassette port project for the Tandy line of
computers (the ones with the cassette port). I have a Coco 3 on the
bench, so I scoped the output line while doing 'csave "jim"'.
On 2/28/2017 11:43 AM, Tony Duell via cctalk wrote:
I fail to see how anyone can be a good digital designer and not
understand analogue
electronics.
A couple points:
* It is entirely possible I am not a good digital designer
* I believe I have a basic understanding of analog, but I may not be
Now that I read your whole email I would like to ask what you plan to do
with this boosted signal? I have never had a CoCo, but most cassette
interfaces on these old computers pretty much all worked like a modem
but you where recording the signal instead of sending it down a phone line.
From
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 abo
On Tue, 28 Feb 2017, Tony Duell via cctalk wrote:
On Tue, Feb 28, 2017 at 5:12 PM, Tapley, Mark via cctalk
wrote:
On Feb 28, 2017, at 9:55 AM, Jim Brain via cctalk wrote:
Analog, which is my nemesis, curses me again.
In my opinion, I fail to see how anyone can be a good digital designer
a
On Tue, Feb 28, 2017 at 5:12 PM, Tapley, Mark via cctalk
wrote:
> On Feb 28, 2017, at 9:55 AM, Jim Brain via cctalk
> wrote:
>
>> Analog, which is my nemesis, curses me again.
I fail to see how anyone can be a good digital designer and not
understand analogue
electronics.
>>
>> I have a cute i
* On Tue, Feb 28, 2017 at 09:55:30AM -0600, Jim Brain via cctalk
wrote:
> Analog, which is my nemesis, curses me again.
>
> I have a cute idea for a cassette port project for the Tandy line of
> computers (the ones with the cassette port). I have a Coco 3 on the bench,
> so I scoped the output
On Feb 28, 2017, at 9:55 AM, Jim Brain via cctalk wrote:
> Analog, which is my nemesis, curses me again.
>
> I have a cute idea for a cassette port project for the Tandy line of
> computers (the ones with the cassette port). I have a Coco 3 on the bench,
> so I scoped the output line while do
74LS of 74HC gates are not going to work, the signal level is only 1V
the threshold for 74LS is 2V and for 74HC it is 3.7V. I would probably
use something like a compatator or an opamp but I don't have a circuit
handy to use, but tehy should be easy to find.
Paul.
On 2017-02-28 11:59 AM, Ale
74hc(or ls)14
Enviado do meu Tele-Movel
On Feb 28, 2017 12:55 PM, "Jim Brain via cctalk"
wrote:
> Analog, which is my nemesis, curses me again.
>
> I have a cute idea for a cassette port project for the Tandy line of
> computers (the ones with the cassette port). I have a Coco 3 on the bench,
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