27 Feb
2012
27 Feb
'12
1:19 p.m.
On 02/26/2012 02:08 PM, Tony Duell wrote:
For monochrome (so not PAL!), it's not much of a problem. The video
signals are the same voltage levels, and the horizontal sync frequencies
are very close -- close enough that most times the 'wrong' monitor will
sync anywaym if noy, it's kist a twak of the horizontal hold control.
Most of the time the other vertical rate is within the range of the hold
control (of ovbvoious reoasns, the same monitor chassis was sold
worldwide), if not the vertical section is genreally easy to modify.
Colour video is a differnet issue of course. RGB has few problems, but
interconverting between NTSC and PAL encoding is 'fun'.
I suspect the _real_ reason is that the monitor
is ratehr more delicate
than the rest of the machine, and would be fairly expnsive to ship.
Delicate and heavy... but I think the issue of hooking a display intended
for NTSC up to a system designed to produce PAL is a bigger one, surely?
I'm expecting that's going to bite me with a lot of my collection when I
eventually ship it over to the US (although one of the things coming over
will be an ACW, so at least I'll be able to tap into its built-in display
for some systems if needed)
As I am sure you know that's a TTL input RGB monitor at normal UK TV
rates. It's actually a Microvitec chassis nad very similar to some of
thei stnadalone monitors. You may be able ot coifugre it for analogue RGB
inouts (at whcih point it'll not longer take the output of the BBC B+
board in the ACW).
-tony