So that's why a 2 systems were getting crappy speeds. Yes, 2. It had been used only to split a single drop from another switch between two systems.
New drop, happy clients.
Some stuff here is museum material.
That thing isn't even old. I had a similar situation occur recently. I found a 10meg 3com hub two months ago. Not 10/100 but 10meg. Not a switch but a hub. It was in a closet between two fairly new switches. I just chucked it not thinking it might be a conversation piece. We replaced the line with a 50m fiber run. We also replaced several drops since they were thirty years old. The customer was really happy with how fast things are now.