On Aug 22, 2022, at 7:27 PM, Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de> wrote:On 8/22/22 19:34, silverdr_at_srebrnysen.com wrote:Is yours the same as this here:https://www.c64-wiki.de/wiki/Procep_SECAMThe TDA3510 is a PAL decoder chip, so a C64 with that module is a standard PAL C64. Output is color difference signals which they probably just run through a SECAM encoder.And doesn't SECAM use frequency modulation to encode the color? That would explain the drifting if the oscillators on the board are not 100% stable and drift with the temperature.Yes I have one of the versions of that Procep SECAM board (there seems to be more than one revision of the PAL decoder / SECAM encoder PCB).As you see it's a PAL decoder using a TDA chip and a SECAM encoder built out of two smaller chips and a lot of discrete components. There are many adjustments on the board. Two of them set the magnitude of the R-Y and B-Y colour difference signals and two more set the FM carrier centre frequencies.RichardReceived on 2022-08-23 00:02:45
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