WC>  MM> For the actual COM port, you should have all four designations.

WC> But there are only three and one's labeled "SEL".

I've got a box of various modems here...
All The ISA USRs (including 0460s) have stencilled:

Com 1 XXX
Com 2 :XX
Com 3 X:X
Com 4 ::X
PnP   :::

Where X is a jumper, and left to right is 0 1 SEL.

  * SLMR 2.1a *

--- Maximus 3.01