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OIPH (Old Instruction Pointer [Hardware])
	Used to store the old IP when hardware interrupts occur

OPRH (Old Privilege Register [Hardware])
	Used to store the old PR when hardware interrupts occur

OIPE (Old Instruction Pointer [Exception])
	Used to store the old IP when (non-double) exceptions occur

OPRE (Old Privilege Register [Exception])
	Used to store the old PR when (non-double) exceptions occur

OIPDE (Old Instruction Pointer [Double Exception])
	Used to store the old IP when double exceptions occur

OPRDE (Old Privilege Register [Double Exception])
	Used to store the old PR when double exceptions occur