Register	Name	Usage
R0	Program Counter (PC)	Holds address of next instruction
R1	Accumulator (AC)	Main working register
R2	Stack pointer (SP)	Points to top of stack
R3	Instruction Register (IR)	Holds currect instruction
R4	Temp Instruction Register (TIR)	Use to decode instruction
R5	0 (ZERO)	Hardwired Constant (like g0 in SPARC)
R6	+1 (ONE)	Hardwired Constant (like g0 in SPARC)
R7	-1 (MINUS ONE)	Hardwired Constant (like g0 in SPARC)
R8	0000111111111111 (AMASK)	Used to extract 12 bit address from instruction
R9	0000000011111111 (SMASK)	Used to extract 8 bit constant from instruction
R10	A register	Scratch register
R11	B register	Scratch register
R12	C register	Scratch register
R13	D register	Scratch register
R14	E register	Scratch register
R15	F register	Scratch register