It may be a misfeature of the ltmodem driver 

Forum: PCMCIA on Toshiba laptops
Re: Question: tecra 8000 rbe-100 and lucent modem red hat 6.2! (ritesh patel)
Re: Idea: SOLVED! kind of...xircom card OR modem work .. both do not (ritesh patel)
Date: 2000, Jul 05
From: David Hinds <dhinds@pcmcia.sourceforge.org>

The ltmodem driver may not work properly in an interrupt-sharing arrangement. There is no way to force the CardBus card to use a different interrupt; this is enforced by the hardware in your laptop. Unfortunately, since the ltmodem driver is binary-only, there is not much that can be done to try to debug the problem. -- Dave

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Ok: problem solved! Re: It may be a misfeature of the ltmodem driver (David Hinds) Date: 2000, Jul 06 From: ritesh patel riteshraja

thank you for the reply. i was able to get both the network card and modem working by moving the load of the ltmodem driver to the start of /etc/rc.d/rc.sysinit. the ltmodem installation program loads the driver at the end of /etc/rc.d/rc.local. for anyone else running a tecra 8000 following is my configuration: i have a xircom xbe-100 network card and the internal modem is a lucent winmodem. in the bios card - cardbus/16 bit. autoselect also works. /dev/ttyS0 0x03f8 irq 4 --> serial port 1 (used for my pilot) /dev/ttyS1 0x02f8 irq 3 /dev/ttyS2 0x1c00 irq 3 --> modem /dev/ttyS3 0x02e8 irq 3 /dev/modem is linked to /dev/ttyS2

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