I just obtained a linksys PCM200 cardbus ethernet card,
and it appears that the PCI ID has changed. lspci -v
gives:

03:00.0 Ethernet controller: Unknown device 1737:ab09 (rev 11)
        Subsystem: Unknown device 1737:ab09
        Flags: bus master, medium devsel, latency 64, IRQ 11
        I/O ports at 4000 [size=256]
        Memory at c0400000 (32-bit, non-prefetchable) [size=1K]
        Expansion ROM at ec400000 [size=128K]
        Capabilities: [c0] Power Management version 2

The tulip driver refuses to load with
/lib/modules/2.4.18-0.18/kernel/drivers/net/tulip/tulip.o: init_module: No such
device

Adding the PCI ID to the table in tulip_core.c makes the module
load successfully and work.

--- linux-2.4.18-0.18/drivers/net/tulip/tulip_core.c.bak        Fri Jun 21
11:56:48 2002
+++ linux-2.4.18-0.18/drivers/net/tulip/tulip_core.c    Fri Jun 21 11:59:24
2002@@ -220,6 +220,7 @@
        { 0x1113, 0x1216, PCI_ANY_ID, PCI_ANY_ID, 0, 0, COMET },
        { 0x1113, 0x1217, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MX98715 },
        { 0x1113, 0x9511, PCI_ANY_ID, PCI_ANY_ID, 0, 0, COMET },
+       { 0x1737, 0xAB09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, COMET },
        { } /* terminate list */
 };
 MODULE_DEVICE_TABLE(pci, tulip_pci_tbl);

(As you can see this is actually a slightly pre-7.3 version of the 
kernel, but I checked the current Rawhide kernel and it still doesn't
have the ID.)