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Values for PCMCIA ExCA Card Services subfunction number:
 00h	Client Services: Get Number of Sockets
 01h	Advanced Client Utilities: Initialize
 02h	Client Services: Register Client
 03h	Client Services: Deregister Client
 04h	Advanced Client Utilities: Enumerate Clients
 05h	Client Services: Register SCB
 06h	Client Services: Deregister SCB
 07h	Advanced Client Utilities: Register MTD
 08h	Advanced Client Utilities: Deregister MTD
 09h	Advanced Client Utilities: Enumerate MTD
 0Ah	Client Services: Get Status
 0Bh	Client Services: Reset Card
 0Ch	Client Utilities: Get First Tuple
 0Dh	Client Utilities: Get Next Tuple
 0Eh	Client Utilities: Determine First Region
 0Fh	Client Utilities: Determine Next Region
 10h	Client Utilities: Get First Region
 11h	Client Utilities: Get Next Region
 12h	Client Utilities: Get First Partition
 13h	Client Utilities: Get Next Partition
 14h	Bulk Memory Services: Open Region
 15h	Bulk Memory Services: Read Memory
 16h	Bulk Memory Services: Write Memory
 17h	Bulk Memory Services: Copy Memory
 18h	Bulk Memory Services: Erase Memory
 19h	Resource Management: Request I/O
 1Ah	Resource Management: Release I/O
 1Bh	Resource Management: Request Memory
 1Ch	Client Services: Modify Window
 1Dh	Resource Management: Release Memory
 1Eh	Client Services: Map Mem Page
 1Fh	Advanced Client Utilities: Return SS Entry
 20h	Advanced Client Utilities: Map Log to Phy
 21h	Advanced Client Utilities: Map Log Phy to Log
 22h	Resource Management: Request IRQ
 23h	Resource Management: Release IRQ
 24h	Bulk Memory Services: Close Region