The C64/3D sc-ff switches automatically. You fit the 15pin DSUB connector into the blanking plate on the C64/3Ds rear plate, unplug your monitor from the C64's DSUB, and plug it into the DSUB you just attached.
When the screen displays a non-RTG (standard Amiga) screen, the module displays that. When it displays an RTG screen, the module automtically switches the displayed output. Think of it as an auto monitor switcher built in to the SD-FF module as well. Extremely useful, and something that I hope a certain owner of an A4K tower system will appreciate in a months time :-)
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