5V PCMCIA is no longer supported.

I would suggest a RATOC cardbus card with 12v power supply.  Cardbus DOES NOT Supply 12v needed by 6 pin firewire interfaces.

They will be hard to find in general due to ALL cardbus makers discontinuing products.

XP SP2 FireWire Performance Fix

Performance of 1394 devices may decrease after you install Windows XP Service Pack 2

Microsoft document and download for fixing possible performance decreases after SP2 installs

Using Ratoc Devices in The Windows Vista

Compatibility chart, driver data, and information for Ratoc products and the Windows Vista

CBFW3 User's Guide Rev.1.0 - RATOC Systems

www.ratocsystems.com/english/support/pdffiles/cbfw3u.pdf

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File Format: PDF/Adobe Acrobat
This User's Guide describes how to install, use, and troubleshoot the RATOC CBFW3. IEEE1394(FireWire) CardBus PC Card for Windows and Macintosh users.

RATOC Systems International,Inc : FireWire CardBus PC Card for ...

Features Adds tow External FireWire ports. IEEE1394.a and OHCI1.0 compliant. Full backward compatibility to IEEEE1394-1995 device. Fully compatible with Apple MacOS8.6/9.x FireWire Drivers. Fully compatible with Apple MacOSX FireWire drivers(CBFW2 Rev.2). * RATOC original MacOSX drivers are required for CBFW2 Rev.1. Learn more at Software Download page. 100,200 and 400 Mbps data rate is automatically supported at each FireWire port. Class 1(15W) cable power is available at FireWire port with optional power adapter(CBFW-CPA, sold separately). Fully compliant with PC Card Standard 7.0. 32-bit Bus-mastering data transfer and 33MHz operation.
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	Compatible FireWire Device, Application software list DV camcorder SONY, Canon, Panasonic, JVC NTSC/PAL model Professional Digital still camera Nikon : D1, Kodak : DCS420,460,8650, Canon : 2000,6000, Phase-one NTSC/PAL to DV converter SONY : DVMC-DA1, Canopus : ADVC-100 FireWire Storage devices -HDD RATOC, VST, Lacie, QPS,Maxtor, Western Digital and more. -CD-RW RATOC, SONY, YAMAHA, QPS, VST and more. -MO Fujitsu, Yano and more FireWire Scanner, Film Scanner Nikon, Minolta, EPSON FireWire to UltraSCSI converter RATOC : FR1SX. >>product page of the FR1SX Application software Apple : iMovie, iTunes, Diskburner, Final Cut Pro Adobe : Premiere6.0 Digital Origin : EditDV, MotoDV, PhotoDV
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	Specifications Host interface - PC Card Standard 7.0 / CardBus spec. compliant. 32bit data bus, bus master DMA transfer capability. PC Card TypeII: 85.6mm(L) x 54mm(W) x 5.0mm(H) FireWire Link Layer - OHCI1.0 compliant. Isochronous DMA 4 channel Asynchronous DMA 2 channel Physical DMA support. PHY Layer - 1394.1995 compatible. - 100,200 or 400 Mbps operation. Automatic detect and negotiation. - Two 400Mbps port (6P FireWire connector x2) - Provide Cable Power to Bus powered FireWire device through cable with optional power adopter(+12VDC/1.5A. 15W class1) Electrical Characteristics - Operational Voltage: 3.3V/DC +/- 0.3V. - Low Power consumption. 237mA idle, 290mA Standby. 325mA Full isochronous receive.