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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: 256byteram on January 28, 2015, 03:34:55 AM
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Hi,
I'm looking at making my own Amiga genlock circuit. It doesn't need to have colour subcarrier sync, only enough to synchronise the RGB and composite sync signals. I have a JVC KM-3000 video desk and a Leitch SPG-110P broadcast sync generator, so there's no chance of the source video dropping out (i.e. I don't/shouldn't need to worry about the Amiga crashing, because the sync will be constant).
I have been trying to find the signal requirements for the Amiga to get it to genlock, without much luck. It looks like if I pull /XCLKEN low on the video socket, and apply a 28.xxxMHz clock it will enter genlock mode, with the /HSync and /VSync outputs becoming inputs. It appears I need to put H/V sync through some monostable multivibrators to stretch out the pulses. But I'm not certain.
What I really need is a timing diagram of some sort. Any help is appreciated.
Thanks.