I am getting the following from the  wvlan_cs driver:

Dec  1 13:41:31 Clementine kernel: wvlan_cs: WaveLAN/IEEE PCMCIA driver v1.0.6
Dec  1 13:41:31 Clementine kernel: wvlan_cs: (c) Andreas Neuhaus
<andy.de>
Dec  1 13:41:31 Clementine kernel: wvlan_cs: index 0x01: Vcc 3.3, irq 3, io
0x0100-0x013f
Dec  1 13:41:31 Clementine kernel: wvlan_cs: Registered netdevice eth1
Dec  1 13:41:31 Clementine kernel: wvlan_cs: MAC address on eth1 is 00 05
5d f1 c3 b0
Dec  1 13:41:32 Clementine kernel: wvlan_cs: This is a PrismII card, not a
Wavelan IEEE card :-(
Dec  1 13:41:32 Clementine kernel: wvlan_cs: Found firmware 0x8 (vendor 2)
- Firmware capabilities : 1-0-0-0-1
Dec  1 13:41:33 Clementine kernel: wvlan_cs: MAC address on eth1 is 00 05
5d f1 c3 b0
Dec  1 13:41:33 Clementine kernel: wvlan_cs: This is a PrismII card, not a
Wavelan IEEE card :-(
Dec  1 13:41:33 Clementine kernel: wvlan_cs: Found firmware 0x8 (vendor 2)
- Firmware capabilities : 1-0-0-0-1
Dec  1 13:41:33 Clementine kernel: wvlan_cs: Valid channels: 1 2 3 4 5 6 7
8 9 10 11

Despite this warning making it sound like the driver is not expected to
work, the card works just fine with this driver. Should the warning still
be there?

The card is "D-Link Air DWL-650".

I saw this on RH 7.2 both with 2.4.7-10 and 2.4.9-13