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.
I've got it covered :) - whole duplicate set of hardware & drive image. Recapped the board last year & replaced PSU too.
I won't touch the DOS software it uses to actually run the plant, the lads can have at that.