[no subject]

What card?  The Apple IIe Workstation networking card has two serial ports.
But I don't think that is what you are asking about.

I've never seen one, but one could be done.  Most 6850 and 6551 based
serial cards used only 4 addresses in the Cn8x space (6850 used 2, 6551
used 4).  Since 16 addresses are available in that space, a quad-port
serial card would not have to be too exotic.  Each port would be controlled
by a different set of addresses.  If phantom slots were implemented, even
more could be controlled.  

I'm not aware of any software that used more than one serial port per
card.  The firmware on the SSC and older 6850 cards I used only supported
one serial port per card, but they only had ONE serial port, so that isn't
too surprising.

A multi-port serial card would be nice for a multi-line BBS system.  I
don't know if any multi-line BBS systems were ever released for the AppleII.

I do have an SSM SIO card that has two serial ports, one DCE and one DTE.
Only one serial chip, and only one port was active at a time.  Preceeded
the Apple SSC card that used the terminal block to switch between DCE
and DTE configs for just the single port connector.  Are you describing
something like this?

  --Steve  (steven-nelson@uiowa.edu)