The 9-pin serial switch boxes I've used had all the lines switched and I've never had any signal problem until the mechanics began to wear after about 8 years. My 15-pin KV (no M) had an AT 5-pin keyboard connector that worked for the Amiga, but I was just switched between RTG and native output. I now have a pure VGA sticky-taped about a DVI switch box for Radeon DVI, Ind AGA MKII, Radeon VGA, and ImpactVision24 VGA. I used to have a printer switch, but I now use my LPR.device and 2 small scripts to change printers.
