13 Jan
2017
13 Jan
'17
2:47 a.m.
So I have a friend who is originally from the U.K. He has his old BBC micro from when he
was a kid and wants to be able to use it here in the states. His parents threw out his
old TV in the U.K.
Is there a way to use a BBC Micro PAL version with a modern US LCD TV? Do some brands of
modern TVs support both NTSC and PAL? Let's assume he may need to grab video before
the modulator.
Thanks,
Corey
corey cohen
u??o? ???o?
13 Jan
13 Jan
3:27 a.m.
On Fri, 2017-01-13 at 05:47 -0500, Corey Cohen wrote:
So I have a friend who is originally from the
U.K.???He has his old
BBC micro from when he was a kid and wants to be able to use it here
in the states.??His parents threw out his old TV in the U.K.??
Is there a way to use a BBC Micro PAL version with a modern US LCD
TV???Do some brands of modern TVs support both NTSC and PAL? Let's
assume he may need to grab video before the modulator.??
I imagine more or less any modern TV should be able to cope with the
576i timings. If you plug the "composite" output (BNC connector) into
the CVBS input on your TV then you'd probably get a decent monochrome
image. The BBC doesn't provide chroma information on its composite
output and, even if it did, I doubt that a US-market TV would be able
to recover the chroma.
To get a colour output you'd have to find a TV which can accept RGB
input and then improvise a way to adapt the TTL-level RGB output from
the DIN socket to the levels that the TV is expecting. I suspect there
might be some adjustment required to the sync signals as well. Or I
think there exist converter boxes for this purpose that can take
"analogue" RGB input and convert to HDMI output, doing scan conversion
at the same time if necessary.
p.
4:14 a.m.
On 13 January 2017 at 11:27, Phil Blundell <pb at pbcl.net> wrote:
I imagine more or less any modern TV should be able to
cope with the
576i timings. If you plug the "composite" output (BNC connector) into
the CVBS input on your TV then you'd probably get a decent monochrome
image. The BBC doesn't provide chroma information on its composite
output and, even if it did, I doubt that a US-market TV would be able
to recover the chroma.
It does if you solder in the link at S30 next to the composite output, that
adds chroma to the signal.
It degrades the signal too, but your point still stands :)
--
adrian/witchy
Owner of Binary Dinosaurs, the UK's biggest home computer collection?
www.binarydinosaurs.co.uk
4:08 a.m.
On Fri, Jan 13, 2017 at 10:47 AM, Corey Cohen <AppleCorey at optonline.net> wrote:
So I have a friend who is originally from the U.K.
He has his old BBC micro from when
he was a kid and wants to be able to use it here in the states. His parents threw out
his old TV in the U.K.
There was actually an NTSC version of the BBC micro. I think you had
to fit a different colourburst crystal,
change a link to disable the phase switching of one of the colour
signals (which is what PAL means, of
course) and a different operating system ROM to reprogram the 6845 for
US rates. The last is probably the
hardest. But anyway...
Is there a way to use a BBC Micro PAL version with a modern US LCD TV? Do some brands of
modern
TVs support both NTSC and PAL? Let's assume he may need to grab video before the
modulator.
I don't know about US TVs, but a lot of UK TVs support NTSC video.
You have 3 video outputs on the Beeb :
UHF RF. This is the old UK analogue TV standard on what was channel
36. PAL encoded
Composite (on a BNC socket). This is UK scan rates, and monochrome by
default. Fitting a
link on the PCB will get PAL colour there.
RGB (on a 6 pin DIN socket). TTL levels, 3 colour signals (so 8
possible colours total) + sync.
If you can find a way to use that, do so. It gives by far the best picture.
-tony
5:09 a.m.
I used to have a little 13 in tv that could handle about anything I
plugged into it, some are made to handle both pal and ntsc automatically.
Ebay comes to mind, I am talking in the crt days, not sure if they still do
all that for LCD tv's but why not?
Bill Degnan
twitter: billdeg
vintagecomputer.net
On Jan 13, 2017 7:36 AM, "Tony Duell" <ard.p850ug1 at gmail.com> wrote:
On Fri, Jan 13, 2017 at 10:47 AM, Corey Cohen
<AppleCorey at optonline.net>
wrote:
So I have a friend who is originally from the
U.K. He has his old BBC
micro from when
he was a kid and wants to be able to use it here
in the states. His
parents threw out his old TV in the U.K.
There was actually an NTSC version of the BBC micro. I think you had
to fit a different colourburst crystal,
change a link to disable the phase switching of one of the colour
signals (which is what PAL means, of
course) and a different operating system ROM to reprogram the 6845 for
US rates. The last is probably the
hardest. But anyway...
Is there a way to use a BBC Micro PAL version with a modern US LCD TV?
Do some
brands of modern
TVs support both NTSC and PAL? Let's assume
he may need to grab video
before the modulator.
I don't know about US TVs, but a lot of UK TVs support NTSC video.
You have 3 video outputs on the Beeb :
UHF RF. This is the old UK analogue TV standard on what was channel
36. PAL encoded
Composite (on a BNC socket). This is UK scan rates, and monochrome by
default. Fitting a
link on the PCB will get PAL colour there.
RGB (on a 6 pin DIN socket). TTL levels, 3 colour signals (so 8
possible colours total) + sync.
If you can find a way to use that, do so. It gives by far the best picture.
-tony
9:05 a.m.
On 01/13/2017 04:47 AM, Corey Cohen wrote:
So I have a friend who is originally from the U.K.
He has his old BBC micro from when he was a kid and wants to be able to use it here in the
states. His parents threw out his old TV in the U.K.
Is there a way to use a BBC Micro PAL version with a modern US LCD TV? Do some brands of
modern TVs support both NTSC and PAL? Let's assume he may need to grab video before
the modulator.
Most RS-170 video monitors (plain composite video input)
should be capable of syncing to monochrome video at PAL
rates. The color scheme is pretty different, so color won't
work, but I'm guessing that is not what the BBC provided.
MUCH more trouble to use an LCD TV, unless it has a
composite input for some compatibility with old stuff. SOME
LCD monitors may have this. If they do, rather likely they
know how to sync to it. Some of those multi-purpose
monitors that have 20 connectors on the back might be a good
one to try, they try to support all formats and electrical
interfaces.
Jon
19 Jan
19 Jan
4:14 p.m.
On Jan 13, 2017, at 2:47 AM, Corey Cohen <AppleCorey at optonline.net> wrote:
Is there a way to use a BBC Micro PAL version with a
modern US LCD TV?
I do it by using a GBS8200 to convert the RGB output to VGA. I also use the original power
supply by changing some jumpers inside to make it work with US 120V power.
http://www.insentricity.com/a.cl/211/to-the-bbc
--
Follow me on twitter: @FozzTexx
Check out my blog: http://insentricity.com
20 Jan
20 Jan
1:37 a.m.
On Thu, 19 Jan 2017, Chris Osborn wrote:
I do it by using a GBS8200 to convert the RGB output
to VGA. I also use
"VGA" is RGB, too ;-)
I guess you mean converting CCIR timing to "VGA" timing. This is not a
matter of simple conversion; you need to recreate the picture (like
sample it and output each scan line twice with the double frequency and
add new sync signals).
Christian
2893
days inactive
2900
days old
7 comments
8 participants
participants (8)
-
AppleCorey＠optonline.net -
ard.p850ug1＠gmail.com -
billdegnan＠gmail.com -
binarydinosaurs＠gmail.com -
cc＠informatik.uni-stuttgart.de -
elson＠pico-systems.com -
fozztexx＠fozztexx.com -
pb＠pbcl.net