Re: Anybody with an oscilloscope as an Apple II display?

["Charlie" <charlieDOTd@verEYEzon.net>]

"Michael Black" <et472@FreeNet.Carleton.CA> wrote in message 
news:fsbmk3$cgr$1@theodyn.ncf.ca...
> "Charlie" (charlieDOTd@verEYEzon.net) writes:
>> <heuser.marcus@freenet.de> wrote in message
>> 979c1f83-bb91-4cc8-977b-9cacad9a5a55@13g2000hsb.googlegroups.com">news:979c1f83-bb91-4cc8-977b-9cacad9a5a55@13g2000hsb.googlegroups.com...
>>> Something on the line of this here:
>>> http://www.youtube.com/watch?v=s1eNjUgaB-g
>>>
>>> Maybe not as detailed but is it feasible at all?
>>
>> It is definitely feasible.  Years ago, I had my Apple II output the video 
>> to
>> a oscilloscope.  Unfortunately, I don't remember how I did it and a 
>> search
>> of my old notes and documents has turned up empty.  I'm not much of a
>> hardware guy, so it couldn't have been too difficult.  I probably saw how 
>> to
>> do it in some magazine article (maybe a Steve Ciarcia article in Byte).
>>
> You were likely using the scope as a monitor.

Yes.  It was just something I tried to see if it would work.

>
> So the actual video signal goes to the z axis (that would control the
> brightness of the trace), the horizontal sync signal to the horizontal
> input and the vertical sync signal to the vertical input.
>
> You'd probably need some bits of circuitry.  You could use the scope's
> sweep to be the horizontal sweep of the "monitor" but you'd need something
> for the vertical.

I do seem to remember making a small circuit, but I was always playing 
around with stuff hooked up to the Apple so I may be thinking of something 
else.  I normally keep all my notes and/or documentation so it's a little 
frustrating to have to rely on my memory :-)

Charlie