1084s Monitor as a preview video monitor on PC. Possible?

[Jope]

S-video is always 15kHz, the hardware in the video card does the conversion for you.

You only need to set a 15kHz screenmode on the PC if you want to connect the 15kHz monitor via RGB.

[Jope]

Of course you can also use a straight RCA cable and the mini-DIN-to-RCA adapter that came with your graphics card.

.. but that's for a 7 pin mini-din with the composite signal in the center pins, please don't bring those into the discussion ..