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