Thanks to everyone who tried to help me, I appreciate that!
The Philips CRT I tried earlier has 2 SCART connectors, one of them should be RGB-compatible, and tried both of them without success.
I meant Pin 8, Pin 16 is wired correctly considering the minimig-VGA2SCART schematic. Pin 8 is unused now, didn't try to connect it so far.
@bernouilli & squid4:
The SCART/Euro-AV/Peritel connector was designed it the 1970's, so it's a quite old standard. In the eastern bloc (I live in Hungary), many TV brands (i.e. Videoton) used non-standard video connectors (like this 6-pin socket: http://elektrotechnika.uw.hu/kep/6pol_DIN.jpg
). These carried only composite video and (mono) audio. After tearing down the Iron Curtain (late 1980's, early 1990's) we had - mostly import - SCART TV's, but as far I know, these had already RGB-compatible connectors.
Made some further investigations:
1. Restored my SCART cable to it's original condition, following Sorgelig's advice. (Formerly tried to fix the PC Engine's corrupted picture using resistors on the Sync pin of SCART connector, which wasn't a clever attempt. Further details in the PCE topic).
2. Connected an old Yamada DVX-6700 standalone DVD Player to my Samsung CRT (model CZ-21N112T), using a standard, full wired SCART cable just to verify if the TV is operational or not. There was an acceptable picture.
3. Switched the DVD player's output from AV to RGB, which resulted slightly better picture quality, so I suppose the TV's SCART input is RGB compatible (it has only one SCART socket).
4. Connected the MIST using the restored (directly wired) minimig-VGA2SCART cable, the result was the same as earlyer, a barely visible, very dark picture.
5. Tried the PCE core, which resulted a very bright, near white, but magenta tinted picture, without any detail.
6. Undusted my good old Philips CM8833 monitor, and compared it's picture to the TV using the c64 and the PCE core, connected with the same standard VGA2SCART cable. In both cases the result was very good, altough the screen of PCE core Was centered to the left (I could easily correct it using the monitor's 'horizontal position' knob).
1. The TV is operational, and it has a working and RGB compatible scart socket.
2. The c64 and the PCE core's video output is somehow different (we already knew that).
3. Old CRT monitors are less picky in aspect of video signals than newer CRT TVs (not a big suprise).
My theory is that some of these old CRTs need to connect a composite (or at least Intensity/Luminance/Monochrome/Y) signal to SCART pin 20 to work properly, 'stripped', pure sync signal is not enough.
I can not confirm it now, but acquisition of an Enterprise 128 is a work-in-prorgress for me, after it arrives I will test it in the above aspect too. It's an interesting machine, has TTL level syncs (separated HSYNC, VSYNC and CSYNC), but linear, non-digital, near-TTL (4V) RGB signals - in this case I MUST use appropriate resistors), and a monochrome composite output on the same edge connector.
See the pinouts here (the video connector is at the bottom of the page) : http://enterprise.iko.hu/pinouts.htm
Abother interesting article about sync signals:https://www.retrogamingcables.co.uk/com ... osite-sync
Nice weekend to all: Gábor