Re: C64 French version (narrow board)

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Mon, 22 Aug 2022 20:25:51 +0200 Message-ID: <8f18fe53-1fe1-5eaf-05dd-8b93f2bc9754_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 8/22/22 19:34, silverdr_at_srebrnysen.com wrote:
> 
> 
>> On 2022-08-22, at 10:50, Richard Atkinson <ratkinson77_at_icloud.com> wrote:
>>
>>> Ah, that might explain! Does anyone here have that French version with extra transcoder board?
>>
>> Yes, I have one here. It gets very hot and produces very drifty SECAM colours - but it does work.
> 
> Is yours the same as this here:
> 
> https://www.c64-wiki.de/wiki/Procep_SECAM

The 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.

  Gerrit