Acorn BBC Micros

From: Lawrence Walker <lwalker_at_mail.interlog.com>
Date: Wed Nov 11 17:21:00 1998

On 9 Nov 98 at 18:57, Tony Duell wrote:

> > > PAL does _not_ necessarily imply 50Hz vertical, though. It just happens
> > > that the 2 most popular TV standards in the world are 60Hz vertical NTSC
> > > and 50Hz vertical PAL B/G/I (those all have the same video signal
> > > essentially). There are other PALs, for example PAL-M and PAL-N. I can
> > > never remember which way round they are, but one is 625 line PAL (50Hz
> > > vertical) with a colour subcarrier near 3.5MHz and the other is 525 line
> > > PAL (60Hz vertical) with a colour subcarrier near 3.5MHz.
> >
> > Who uses these other standards? I've heard that some South American
> > countries use different TV standards from just about anywhere else.
>
> I believe one is South America and the other is South Africa. I wouldn't
> like to bet on it, though.
>
> More interesting is why a PAL-N (625 line, 3.5... MHz colour subcarrier)
> encoder/decoder appeared in a clearout in London. I don't know the answer
> to that.
>
SNIP
>
> I've seen colour _monitors_ that will decoder almost anything (a typical
> selection is PAL, NTSC3.58, NTSC4.43 (which is what some VCRs output in
> the UK if given an NTSC tape), SECAM, RGB, all at 50 or 60Hz). I've not
> got one (yet), though.
>
> > Another thing that would be great would be a VCR that could record/play
> > PAL and/or 50Hz.
>
> They're trivial to find in the UK....
>
> -tony
>
 In sections of Toronto where there are large south-east asian populations
there is a thriving business in changing tapes to the N.A. standard. With the
right equipment it sounds like it would be trivial to do. What would be
required ?

ciao larry
lwalker_at_interlog.com
Received on Wed Nov 11 1998 - 17:21:00 GMT