NOTE: If you need to specify a non-standard port address and IRQ, then 
the syntax is PORT:AAAA:X where AAAA is the base address and X is the IRQ. 

PORT is optional, and VISCON will default to standard addresses and irq's
if PORT is not used. VISCON will assume COM1 = 03F8 IRQ 4, COM2 = 02E8 
IRQ3, COM3 = 03E8 IRQ4 and COM4 = 02E8 IRQ 3.  If you have a different 
non-standard port address and irq, you would then use the PORT cmd to change
the defaults. 

Below is some examples of how VISCON could be called up Notice PORT is always
the second or third (last) argument on the commandline. 

    ie...

    VISCON  PCBOARD.SYS  PORT:xxxx:a

VISCON also supports the use of FOSSIL drivers.  The syntax for a FOSSIL
driver is: PORT:F:P. The 'F' tells VISCON to use a Fossil driver for it's
communications.  The 'P' following it tells it which port to use for the
Fossil. Example - PORT:F:1, tells VISCON to use a fossil driver for port 1.

Digiboard Intelligent Async boards are  supported thru the Universal
DOS driver for Digiboard.  The syntax is the same as the Fossil driver
except you replace the F with D and give the channel number to use.
Example - PORT:D:6 tells VISCON that it is connected to a Digiboard and 
to use channel 6 on the Digiboard.


EXAMPLES: 

VISCON  Pcboard.sys                    ;Using standard ports
VISCON  Pcboard.sys PORT:03E8:5        ;Using non-standard port
VISCON  Pcboard.sys PORT:F:1           ;Using a fossil driver on port 1
VISCON  Pcboard.sys PORT:D:5           ;Using Digiboard channel 5