Mathco Tech. Dep wrote:
>I'm building a new Linux system with a
>asus k7m and a A-Open FM56 ITU/2 ISA Modem,
>my problem is that it it finds the modem
>as a com-port during start-up but refuses
>to let me use the com-port afterwards,
>it does the same in the *OTHER* operating system
>also. I have tried many of the same Modems.
>If anyone has used these components please
>let me know if there is a solution for it.
You must ensure that the jumpers on the modem are set to use a free com
port, and to use a free interrupt. Then, you must ensure that the system's
corresponding com port is disabled via the bios (or jumpers on the i/o
card).
One way of avoiding messing with the existing com ports is to set the modem
to use com3 and interrupt 5, assuming, of course, that no other device is
using interrupt 5.
Here are the "standard MS-DOS" port associations:
/dev/ttys0 (COM1), port 0x3f8, irq 4
/dev/ttys1 (COM2), port 0x2f8, irq 3
/dev/ttys2 (COM3), port 0x3e8, irq 4
/dev/ttys3 (COM4), port 0x2e8, irq 3
These are the 'standard' interrupts:
IRQ 0 Timer channel 0
IRQ 1 Keyboard
IRQ 2 Cascade for controller 2
IRQ 3 Serial port 2
IRQ 4 Serial port 1
IRQ 5 Parallel port 2 (Reserved in PS/2)
IRQ 6 Floppy diskette
IRQ 7 Parallel port 1
IRQ 8 Real-time clock
IRQ 9 Redirected to IRQ2
IRQ 10 Reserved
IRQ 11 Reserved
IRQ 12 Reserved (Auxiliary device in PS/2)
IRQ 13 Math coprocessor
IRQ 14 Hard disk controller #1
IRQ 15 Hard disk controller #2
Janyce
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