The Atari ST 1040, Commodore C64 and C64C, Sinclair ZX Spectrum +3 will be tested next - as soon as I make the special cables for them. I tested the converter with Yamaha YIS805 and YIS503, Panasonic FS-A1, Sony F1-XV and Amiga 500. The pinout for the VGA connector matches the real VGA's pinout for convenience. In order to connect a vintage computer to the converter, you have to make a special cable from computer's RGB port to the male VGA connector. The standard 15-pin VGA female connectors are used for input, the output has RCA and S-Video connectors. There's a switch that allows to chose either composite or separate sync signals. The quality of S-Video output is indeed great, PAL and NTSC seems to work correctly, both sync signal types are supported. I called this device "Zefisha" (don't ask why and what this means).
So, the prototype based on AD724 chip is now ready and is working fine. The quality of composite video is acceptable, but nothing compared to S-Video. The output from such converter is a high quality S-Video signal, that can be easily converted to VGA with a cheap 15 euro Chinese-made Video-to-VGA converter. My idea is to create a universal converter that supports PAL and NTSC and that could be used for any vintage computer that has R, G, B and either composite or separate (horizontal+vertical) synchronization signals. It's impossible to connect most of MSX computers to such converter without splitting the synchronization signal first. However, most of them are made for specific hardware, for example for Amiga.
There are plenty of such projects on Internet. The idea of creating a converter for connecting vintage computers to modern VGA monitors is not new.
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