sync on green to horizontal and vertical wiring seperator.

11 Jun 2001

...
  From:          ard(a)p850ug1.demon.co.uk (Tony Duell)
 Subject:       Re: sync on green to horizontal and vertical wiring seperator.
 To:            classiccmp(a)classiccmp.org
 Date:          Mon, 11 Jun 2001 22:06:25 +0100 (BST)
 Reply-to:      classiccmp(a)classiccmp.org 
...

 On 11 Jun, Tony Duell wrote:

 [LM1881]
  And I think that at least the Eleantec version
can handle the
 sync rates of (at least) VGA monitors,=20
From the features section of the National Semiconductor LM1881 data  sheet:
 	Horizontal scan rates to 150kHz  
 Which would seem to be fast enough for any normal PC or Mac monitor.... 
Hmm, did took a look at it's pdf documentation on LM1881 but I still 
don't see what can be done to get horizontal sync as well as vertical 
sync which this latter is already done on LM1881?

Yes, I do understand this doc well to understand what it is missing 
despite 150KHz horizontal is plenty!  But not as composite which my 
goal is seperate H and V sync.

Both composite sync and sync on green monitors still have to split 
them to drive horizontal and vertical circuits.

Oh, I think mine does output composite syncs if I can find info about 
this, would be easier but no different than sync on green since all 
syncs is negative going while video part is positive going I think.

Cheers,

Wizard

...

 -tony

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

sync on green to horizontal and vertical wiring seperator.