video adapter board with the old H and V wires removed and a new CSYNC wire added.
https://files.mastodon.social/media_attachments/files/116/264/491/255/659/517/original/37e81938cb69544b.png
my 13W3 Video Snake Oil (https://github.com/schlae/13W3) lets you wire up the adapter in a number of ways. on a hunch, let's try and wire pin 5 (CSYNC) up to the HSYNC on the VGA video connector.
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