Dragon 32 RGB SECAM and video tests

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Azerpy
Posts: 36
Joined: Tue Apr 09, 2019 1:16 pm
Location: France Pyrenées

Re: Dragon 32 RGB SECAM and video tests

Post by Azerpy »

Hello Mike
Thank you for your interest and care for all those things about the Dragons.
Yes you are right, I wrote on 27 july "The good input of luma is not exactly the output Y of the VDG ...
For his RGB converter, Retrocant must pick up into the PAL machines and adapt with a transistor or other way a signal similar with the one I named "LUM" present on my RGB SECAM Dragons pin 7 of PL6 and pin 7 of PL10 (see first schematic on this topic).
By me, it's somewhere after the output of IC 4053 multiplexor. On my RGB SECAM Dragons, the logic circuitry before the multiplexor is quite the same as on PAL schematics of D32 and D64.
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