FWIW, Windows98 has this to say about PCMCIA and sound:

Cirrus Logic PD6832 CardBus Controller
	IRQ 10
	Memory 06000000 - 06000FFF
	IO Range 1020 - 102f
Cirrus Logic PD6832 CardBus Controller
	IRQ 10
	Memory 06002000 - 06002FFF
PCMCIA
	Memory 06001000 - 06001FFF
OPL3-SAx WDM
	DMA 0,1
	IRQ 9
	IO 220-22f, 530-537, 388-38f, 330-331, 370-371
OPL3-SAx Gameport
	IO 201-201


NetBSD says this:
NetBSD 1.4 (GENERIC) #0: Fri May  7 12:27:31 PDT 1999
    perry@cynic.cynic.net:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: family 6 model 6 step a
cpu0: Intel Pentium II (Celeron) (686-class)
real mem  = 100270080
avail mem = 89415680
using 1249 buffers containing 5115904 bytes of memory
mainbus0 (root)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o enabled, memory enabled
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82443BX Host Bridge/Controller (AGP disabled) (rev. 0x03)
vga1 at pci0 dev 2 function 0: Trident Microsystems CYBER 9397 (rev. 0xf3)
wsdisplay0 at vga1: console (80x25, vt100 emulation)
pcib0 at pci0 dev 7 function 0
pcib0: Intel 82371AB PCI-to-ISA Bridge (PIIX4) (rev. 0x02)
pciide0 at pci0 dev 7 function 1: Intel 82371AB IDE controller (PIIX4)
pciide0: bus-master DMA support present
pciide0: primary channel wired to compatibility mode
wd0 at pciide0 channel 0 drive 0: <TOSHIBA MK6411MAT>
wd0: drive supports 16-sector pio transfers, lba addressing
wd0: 6194MB, 13424 cyl, 15 head, 63 sec, 512 bytes/sect x 12685680 sectors
wd0: 32-bits data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2
pciide0: primary channel interrupting at irq 14
pciide0: secondary channel wired to compatibility mode
atapibus0 at pciide0 channel 1
cd0 at atapibus0 drive 0: <TOSHIBA CD-ROM XM-1802B, , 1119> type 5 cdrom removable
cd0: 32-bits data port
cd0: drive supports PIO mode 4, DMA mode 2
pciide0: secondary channel interrupting at irq 15
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data transfers)
cd0(pciide0:1:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
uhci0 at pci0 dev 7 function 2: Intel 82371AB USB Host Controller (PIIX4) (rev. 0x01)
uhci0: can't map i/o space
Intel 82371AB Power Management Controller (PIIX4) (miscellaneous bridge, revision 0x02) at pci0 dev 7 function 3 not configured
Cirrus Logic product 0x1110 (CardBus bridge, revision 0xc1) at pci0 dev 10 function 0 not configured
Cirrus Logic product 0x1110 (CardBus bridge, revision 0xc1) at pci0 dev 10 function 1 not configured
isa0 at pcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
lpt0 at isa0 port 0x378-0x37b irq 7
sb0 at isa0 port 0x220-0x237 irq 5 drq 1: dsp v3.01
midi0 at sb0: <SB MIDI UART>
audio0 at sb0: half duplex
opl0 at sb0: model OPL3
midi1 at opl0: <SB Yamaha OPL3>
wss0 at isa0 port 0x530-0x537 irq 10 drq 0 drq2 1: CS4231 or AD1845
audio1 at wss0: full duplex
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
opms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
pcppi0 at isa0 port 0x61
midi2 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff: using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
pcic0 at isa0 port 0x3e0-0x3e1 iomem 0xd0000-0xd3fff: using irq 9
pcic0: controller 0 (Cirrus PD672X) has sockets A and B
pcmcia0 at pcic0 controller 0 socket 0
pcmcia1 at pcic0 controller 0 socket 1
isapnp0: no ISA Plug 'n Play devices found
biomask c040 netmask c040 ttymask d2c2
wscons: wskbd0 glued to wsdisplay0 (console)
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs

I'll be trying the cardbus patches now to see if they stop it freezing when
I load a card.

Darren