Date   : Wed, 29 Nov 2006 10:05:13 +0000 (WET)
From   : PCOGHLAN@... (Peter Coghlan)
Subject: Running on an NTSC display?

>
>For all, you'll need a different MOS so the 6845 CRTC gets poked to generate
>60 fields a second and appropriately reduced line count.
>

Ok.

>
>For composite, the colour crystal needs changing from 4*4.43 to 4*3.59.
>

Theres got to be a bit more to it than that. Theres more to the differences
between NTSC and PAL than just the subcarrier frequency. I suspect that
a board modification of some sort is required to undo the extra feature(s)
PAL has over NTSC.

It might be simpler to leave the beeb generating PAL and use an NTSC/PAL
capable TV. Or maybe an RGB monitor, either 625 lines 50 fields if such a
thing is available locally or 525 lines 60 fields if not, with the MOS
changed as suggested.

Do the Americans have anything like SCART? If so, it might be possible to
use a regular TV as an RGB monitor.

Regards,
Peter.