The reason I wanted to use PS2 is precisely because my KVM switch uses PS/2. I've got to say that the USB hardware I've acquired seldom is fully functional, i.e. seldom does everything it's supposed to do. Several USB printers only sort-of work, my USB inspection microscope only sort-of works, and the several USB and Ethernet interfaced printers I have work great with Ethernet, but frequenly fall down via USB.

I know I represent only a small sample, since I have only about 25 printers, and since the two USB keyboards and 3 USB mice I have actually do work quite well, but I've not been led to believe that USB is all it claims to be. It's certainly true that many applications that "talk" through a parallel port won't work when the parallel port is provided via USB.

There were, at one time, quite a number of complaints that MCU programmers interfaced via the serial port worked fine, but didn't work when a USB-generated serial port was used. Similar statements appeared regarding the USB-adapted parallel ports.

Aside from that, Windows often takes a multi-second vacation while processing USB transfers.

What's up with all that?

RE