{
  "SP":   0,
  "LCL":  1,
  "ARG":  2,
  "THIS": 3,
  "THAT": 4,

  "R0":  0,
  "R1":  1,
  "R2":  2,
  "R3":  3,
  "R4":  4,
  "R5":  5,
  "R6":  6,
  "R7":  7,
  "R8":  8,
  "R9":  9,
  "R10": 10,
  "R11": 11,
  "R12": 12,
  "R13": 13,
  "R14": 14,
  "R15": 15,

  "SCREEN": 16384,
  "KBD":    24576
}