Prb with COM ports

[Tom Hanlin]

Drivers may not be needed but, the PC was only designed for a maximum
of four serial ports. The comm support built into PowerBASIC will let
you specify IRQs and shows how to modify the internal port addresses
for those four ports. I don't think there is any chance of using more
than four ports at a time with OPEN "COMx".

You might check out some of the comm libraries available here:

http://www.powerbasic.com/files/pub/pbdos/telecom/


There used to be FOSSIL drivers available for all kinds of machine
configurations. It might be worth looking into.

It seems like the manufacturer of the comm board ought to be able
to offer some suggestions.

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Tom Hanlin, PowerBASIC Staff
Opinions expressed may not be those of my employer or myself

[Mel Bishop]

First, I would check with the manufacturer to see if the card
is supported by a DOS program.

Assuming it is, make sure any drivers supplied are installed
correctly.

Check any hardware/software jumpers and make sure your program
is trying to access the correct port with the correct IRQ.

Just a couple of thoughts.


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[Georges GUILBERT]

Under Dos 6 & PB35
With a nova 300 board + PC 104 multiport board
--> 8 COM ports

I've just add the multiport board and I can't address
the COM 5,6,7 & 8

1. Is it possible
2. How to ?

Thanks a lot, i'm desperate

Code I use :
OPEN "COM4: 9600,N,8,1,IR3,CS0,DS0,CD0,RS" For Random as #2
Code that create a "ERROR 53: File not found" :
OPEN "COM5: 9600,N,8,1,IR3,CS0,DS0,CD0,RS" For Random as #2
OR
OPEN "COM5: 9600,N,8,1,IR7,CS0,DS0,CD0,RS" For Random as #4


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Georges MM13

[This message has been edited by Georges GUILBERT (edited November 04, 2004).]