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 INT 67 - Virtual Control Program Interface - Installation check
 INT 67 - Virtual Control Program Interface - Get protected mode interface
 INT 67 - Virtual Control Program Interface - Get max physical memory address
 INT 67 - Virtual Control Program Interface - Get number of free 4k pages
 INT 67 - Virtual Control Program Interface - Allocate a 4k page
 INT 67 - Virtual Control Program Interface - Free 4k page
 INT 67 - Virtual Control Program Interface - Get phys addr of page in first mb
 INT 67 - Virtual Control Program Interface - Read cr0
 INT 67 - Virtual Control Program Interface - Read debug registers
 INT 67 - Virtual Control Program Interface - Set debug registers
 INT 67 - Virtual Control Program Interface - Get 8259 interrupt vector mappings
 INT 67 - Virtual Control Program Interface - Set 8259 interrupt vector mappings
 INT 67 - Virtual Control Program Interface - Switch to protected mode