The RF input on the XK series of Profeel monitors is a IDC-34 connector, like on a floppy drive. The KV-1311CR had the same connector.
The RGB signal can be either digital or analog, the digital is TTL digital and conforms with the CGA standard.
Analog RGB must have a standard NTSC scan rate, there where adapters for the Atari ST and Apple IIgs to allow the RGB input to be used with those computers.
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