Date   : Thu, 19 Feb 2004 18:54:44 +0000 (GMT)
From   : Sprow <info@...>
Subject: Re: Domesday oddness (difference between model B and Master video output?)

In article <1077212135.1527.101.camel@...>,
   Jules Richardson <julesrichardsonuk@...> wrote:

[snip]

> But, what's the difference electrically between the BBC B and the
> Master's video output? There must be some subtle timing difference
> between the two. I know that BBC B works fine with a monitor, it's just
> the LVROM doesn't seem to like it for some reason. 

The video output from both the beeb and the Master is a quite liberal
interpretation of the PAL spec - it's been a couple of years since I looked
on a scope and can't be bothered to wheel over to the other side of the room
to turn it on, but
 - sync was rather higher than 0.3V
 - colour burst started too soon after end of sync
 - vertical serrations were a bit naff
Most TVs and monitors don't really care, but I guess the combination of 20
years' of drift on the beeb and 20 years of drift on the genlock have taken
their toll!
Sprow.