NOP     = 0 # No operation
HLT     = 1 # Halt
RST     = 2 # Reset
DBG     = 3 # Enables Debug
LDI     = 4 # Load Immediate
PUSH    = 5 # Push
POP     = 6 # Pop 
JMP     = 7 # Jump to address
JZ      = 8 # Jump to address if zero
CMP     = 9 # Compare and set zero flag