[Coco] PICs and S-Video

[Gene Heskett]

On Thursday 23 February 2006 09:07, Chris Hawks wrote:
>---Reply to mail from John Kowalski about [Coco] PICs and S-Video
>
>> Maybe I'm overlooking something, but it seems that maybe an ordinary
>> 556 (dual timer) chip could do the trick.  It wouldn't delay the
>> HSYNC per-se, but I figure it could be used to generate a new HSYNC
>> signal using the original HSYNC for reference.
>>
>> Possibly something along the lines of:
>> -Timer 1 being set to the delay between the original HSYNC and the
>> new HSYNC. -Timer 2 being set to the pulse width of the new HSYNC.
>> -The original HSYNC would trigger timer 1 and reset timer 2.
>> -The output of timer 1 would be your new HSYNC and also trigger
>> timer 2. -The output of timer 2 would reset timer 1.
>
>    Yeah, that's how it started. But, the 555(6) output is high when
> the trigger is low (and HSYNC from the Coco3 is a high pulse), so
> I'll have to invert HSYNC (another chip!) before it's fed to the
> timer 1. I should be able to de-couple the connection from timer 1 to
> timer 2 with an RC network.

How about just setting the timer to trigger on the trailing edge, and 
set the time to around 60 u-secs?  The timed out condition becomes the 
new synch pulse then.

>---End reply
>
>Christopher R. Hawks
>HAWKSoft
>----------------------------------------------------------------------
>--- Hey! It compiles! Ship It!

-- 
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