[Coco] S-video Prospects...

[John Kowalski]

At 02:06 PM 26/01/2006 -0600, CoCoList for Color Computer Enthusiasts wrote:
>>> Yep, there's the "missed HSYNC" problem for the first scanline.
>
>> I think the simplest way to generate a new (earlier) HSYNC  would be to
>> simply use the existing HSYNC pulse to start a timer and when the timer
>> finishes, to generate a pulse. On the next incoming HSYNC, simply reset 
>> again.
>>
>> This would make a new HSYNC that starts a bit before the original, and 
>> ends
>> right at the moment that the original starts.  That should probably result
>> in shifting the 80 column display about 4 characters to the right.
>>
>>                                         John Kowalski (Sock Master)
>> 
>> http://www.axess.com/twilight/sock/
>
>
> Wouldn't the newly generated sync pulse still arrive after the first line? 
>After all, the timer has to have the first one to delay the pulse into the 
>next line.

Yes, the HSYNC would arrive one line later, but HSYNC is just a continuous
repeating signal.  There's no difference between one line or the next.  The
TV will just accept the new repeating signal in place of the old and not
know anything is different.

                                         John Kowalski (Sock Master)
                                         http://www.axess.com/twilight/sock/