BBC Master genlock card

[Jules]

Anyone come across a Cox 630B genlock card for a BBC Master before? I
found one built into a BBC Master that was in a haul of Acorn stuff I
got the other day.

Some documentation would be nice! I'm not sure if the card was
designed specifically for the BBC or intended for anything that had
TTL RGB output. Certainly the fitting into the case isn't particularly
professional :)

The host machine is fried (I've not investigated the actual fault yet)
but hopefully the genlock is still ok.

cheers

Jules

[Alan Williams]

julesrichardsonuk@yahoo.co.uk (Jules) wrote in message news:<5c07806a.0307250723.4c323912@posting.google.com>... Anyone come across a Cox 630B genlock card for a BBC Master before? I found one built into a BBC Master that was in a haul of Acorn stuff I got the other day. Some documentation would be nice! I'm not sure if the card was designed specifically for the BBC or intended for anything that had TTL RGB output. Certainly the fitting into the case isn't particularly

No it would have to be specific to the M128. To achieve the 'lock' in
genlock the board has to be able to push the system clock around to
keep the output in sync with the external video feed.
professional :) The host machine is fried (I've not investigated the actual fault yet) but hopefully the genlock is still ok.

Given the interaction between the genlock and the system clock I would
not be so sure. If you take this genlock out you will have to either
link or solder up the system clock path that gets divided by this
board, otherwise the m128 will be stone dead.

I *may* have some acorn info on how genlock and m128 work. Let me
know if you want me to look.

Alan
cheers Jules

[Jess]

In message <5c07806a.0307250723.4c323912@posting.google.com>
julesrichardsonuk@yahoo.co.uk (Jules) wrote: Anyone come across a Cox 630B genlock card for a BBC Master before? I found one built into a BBC Master that was in a haul of Acorn stuff I got the other day. Some documentation would be nice! I'm not sure if the card was designed specifically for the BBC or intended for anything that had TTL RGB output. Certainly the fitting into the case isn't particularly professional :) The host machine is fried (I've not investigated the actual fault yet) but hopefully the genlock is still ok.

The BBC used to use BBC micros to generate some logos (eg Children's
BBC in 1987), they had to be genlocked.

--
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RISC OS 4.36 kinetic 64+128+2M Castle Storm DMA + 17GB 586-133 I-3 ADSL


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[Jules]

ajw@genesis.net.au (Alan Williams) wrote in message news:<b3d1863d.0307282147.1526e58e@posting.google.com>... Anyone come across a Cox 630B genlock card for a BBC Master before? I
.... I *may* have some acorn info on how genlock and m128 work. Let me know if you want me to look.

If you could that'd be great! I doubt many of these setups are still around, so
whilst I do have most Acorn docs, information on this card is non-existant so
far.

Whether the board's been cooked or not is unknown at the moment, but
transplanting it into another m128 would be no trouble at all. I'll do some
testing on the machine itself next week though; I haven't even had a chance to
re-seat chips or anything like that yet.

cheers

Jules

[Alan Williams]

Jess <phantasm_39@hotmail.com> wrote in message news:<b6cf78194c.news@itworkshop.invalid>... In message <5c07806a.0307250723.4c323912@posting.google.com> julesrichardsonuk@yahoo.co.uk (Jules) wrote: Anyone come across a Cox 630B genlock card for a BBC Master before? I found one built into a BBC Master that was in a haul of Acorn stuff I got the other day. Some documentation would be nice! I'm not sure if the card was designed specifically for the BBC or intended for anything that had TTL RGB output. Certainly the fitting into the case isn't particularly professional :) The host machine is fried (I've not investigated the actual fault yet) but hopefully the genlock is still ok. The BBC used to use BBC micros to generate some logos (eg Children's BBC in 1987), they had to be genlocked. -- Jess icq: 91353267 msn: phantasm_39@hotmail.com http://www.kentwebnet.com Hotmail is my spam trap - don't use for email mailto:nospam@itworkshop.uklinux.net RISC OS 4.36 kinetic 64+128+2M Castle Storm DMA + 17GB 586-133 I-3 ADSL -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =-----

I had a look last night in the location I expected the circuits to be,
they were not there. I will have another look tonight. I am sure I
still have them.

Alan

[Chris Evans]

In article <b6cf78194c.news@itworkshop.invalid>, Jess
<URL:mailto:phantasm_39@hotmail.com> wrote: In message <5c07806a.0307250723.4c323912@posting.google.com> julesrichardsonuk@yahoo.co.uk (Jules) wrote: Anyone come across a Cox 630B genlock card for a BBC Master before? I found one built into a BBC Master that was in a haul of Acorn stuff I got the other day. Some documentation would be nice! I'm not sure if the card was designed specifically for the BBC or intended for anything that had TTL RGB output. Certainly the fitting into the case isn't particularly professional :) The host machine is fried (I've not investigated the actual fault yet) but hopefully the genlock is still ok. The BBC used to use BBC micros to generate some logos (eg Children's BBC in 1987), they had to be genlocked.

IIRC the clock they used to show between programs was BBC B generated.


Chris Evans

--
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