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Path: utzoo!mnetor!seismo!mcvax!cernvax!ethz!claudio
From: claudio@ethz.UUCP (Claudio Nieder)
Newsgroups: comp.sys.amiga
Subject: Re: Genlock crashes Amiga
Message-ID: <129@bernina.UUCP>
Date: Tue, 7-Jul-87 12:17:39 EDT
Article-I.D.: bernina.129
Posted: Tue Jul  7 12:17:39 1987
Date-Received: Sat, 11-Jul-87 01:31:00 EDT
References: <1310@briar.Philips.Com> <220@Mannix.iros1.UUCP>
Reply-To: claudio@bernina.UUCP (Claudio Nieder)
Organization: ETH Zuerich, Switzerland
Lines: 17

In article <1310@briar.Philips.Com> hjs@philabs.Philips.Com (Hugo J. Strubbe) writes:
>
>I have been using the AMIGA 1300 GENLOCK successfully for several weeks.
>Then, something went wrong, and now I cannot boot the AMIGA anymore
>when the GENLOCK is plugged in. The system seems to hang while trying to 
>read the kickstart disk: the disk drive light comes on and stays on for ever...
>When I unplug the genlock, it boots again.
>I have tried to boot with and without an external video signal present, but
>it makes no difference.   ...

I don't have the Genlock, but I know from some experiments I did myself with
external sync, that after loading Kickstart, the Amiga will look if there is
any signal on the H and V sync inputs, and if it finds anything, even if not 
really syncpulses, it will enable external synchronisation.
So from this moment on the Amiga needs correct sync pulses from your Genlock
to bring up an image. As your Genlock is broken, it will supply a wrong signal,
probably only a DC voltge, and your screen stays dark.