[Coco] S-video Prospects...

[Stephen H. Fischer]

Hi,

In the first attack I had great difficulty in understanding how the wrong 
statements could have been made, it took a long time to finally understand.

It has been many decades since I had a course in Analog Computing and then 
at the start of the IC digital age there was not too much time spent even 
then on Analog. I did well in almost all EE areas and understood Analog 
computing just fine.
.
One of the lab experiments was to show that an IC could perform a "AND" 
function, that being the state of the art at the time. They spent a lot ot 
time on tubes.

As the Digital world has grown to such domance today, I suspect that Analog 
Computing is still taking a back seat, perhaps not even a required part of 
current EE studies.

The first incorrect statement had to been made by trying to understand how 
the analog circuit works by applying the more well known digital processing 
methods.

Analog computing is different from digital computing and has it's 
limitations in different areas. The first attack stated a possible problem 
that a purely digital solution might have a problem with.

The Analog AD 72x IC's are using  analog processsing even though parts of it 
appear to be doing things using digital.

I must admit that the details of how the chips operates are more than I can 
understand today as I am not following that area of electronics.

Never the less, I recognized an analog process in the description even 
though my mind slipped into the digital world at first in trying to 
understand what was being done. I then built an analog understanding. I was 
able at that point to understand how someone with lots of digital knowledge 
but not as good understanding of analog computing might not take the step to 
an analog understanding and think that the analog AD72x had a digital 
problem which it of course does not.

That attack posting was the only one made to the list and may have well shut 
off postings by others.

A very glowing post was made to B.L.CoCo, one that if made to the list may 
have started some of the positive discussion that are occuring now.

That's why I said that the interest in CoCo 3 to S-Video was ZERO, basing 
that on the attack posting being the only comment made.

If you still believe that you are proving correct information, I am sorry 
for your lack of understanding of electronics.

The CoCo is in the NTSC world as so much of electronics today are. That 
world is very well understood and few if any EE's are allowed to make any 
mistake at all because any errors can be recognized very early due to the 
widespread knowledge of NTSC.

The AD72x was designed to accept input from the very well known NTSC world.
The CoCo is a correct member of that world.
There just cannot be any problem in connecting the two together.

Yes perhaps I have the only currently CoCo 3 operational version. I would 
have to plug the wires back into the quick breadboarding block as the AD723 
is in use every day converting the picture from my HTPC to my S-Video 
television. Perhaps I would make a cable with the three 100 Ohm resistors 
and eliminate the breadboard.

Yes I am waiting for someone to duplicate the circuit and announce that it 
works just fine for them also. As there are no adjustments at all and 
assuming that the circuit is built correctly I am sure that the same great 
results will be obtained.

The AD73x was designed to perform a specific function, the exact same one 
that I am using it for in both the HTPC and the CoCo 3 applications. The 
exact function that it is being sold in large quanities to perform in a very 
wide list of projects. As serveral versions have already been produced and 
sold it appears to be a very profetable item.

We should be supporting any and all CoCo projects and not trying to kill 
them which seems to be the modivation for these absurd attacks.

None of your comments have been usefull except perhaps to continue the 
negative tone that this list takes too much orf the time.

We need to spend more time helping people produce sucessful projects instead 
of pointing out each and every possible problem and in this case showing 
their lack of understanding.

As to the cost, any price
jdaggett at gate.net wrote:
> Well excuse me for pissing you off!
>
> While your little experiment seems to work on a vast sample of "ONE", I
> am not convince
> that your simple circuit is robust to work on many. Secondly I have
> stated two issues that
> are not false information. So if you think that they trivial then that is
> your choice. Granted I have not tried the AD725 in any circuit form so I
> cannot verify your claims. IF this is an anoyance to you then so be it. I
> will then be anoying. I have just issued some concerns from the
> specifications of both the AD725 and the Color Computer itself.
>
> Besides I think you far under estimate the material costs. The chip alone
> is $9 and a 16 pin surfboard is in the $6 range. Two items and you are
> already at $15. Now if one has a very
> well stocked parts bin then maybe $15 is realistic. I seriously doubt
> that the average person out there can do it for that cost.
>
>
>
> james
>
>
> On 4 Jan 2006 at 18:22, Stephen H. Fischer wrote:
>
> From:           "Stephen H. Fischer" <SFischer1 at MindSpring.com>
> To:             "CoCoList for Color Computer Enthusiasts"
> <coco at maltedmedia.com>
> Subject:        Re: [Coco] S-video Prospects...
> Date sent:      Wed, 4 Jan 2006 18:22:57 -0800
> Organization:   A. Nani Mouse Inx.
> Send reply to:  CoCoList for Color Computer Enthusiasts
> <coco at maltedmedia.com>
> <mailto:coco-request at maltedmedia.com?subject=unsubscribe>
> <mailto:coco-request at maltedmedia.com?subject=subscribe>
>
>> Hi,
>>
>> What!!! Another stupid reply. I am getting tired of these.
>>
>> Most people on this list know that statement is wrong.
>>
>> The CoCo 3 produces *exactually* what the AD72x chips are designed to
>> convert to NTSC S-Video.
>>
>> First is it was too fast or slow I forget, now this totally wrong
>> statement.
>>
>> Go stand in the corner for 3 hours with a dunce hat!
>>
>> Stephen H. Fischer
>>
>> jdaggett at gate.net wrote:
>>> Stephen
>>>
>>> One major problem with the AD72x series of chips is that they require
>>> RGB interlace signal. The Coco 3 is non-interlace RGB.
>>>
>>> james
>>
>>
>>
>> --
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