 # currently in the up position, PC is increased by 2.
 #/
 inst_ExA1_SKNP = (x) ->
-  # todo
+  if registers[x] not in getKeyPresses() then PC += 2
 
 # #### Fx07 - LD Vx, DT
 

# Checks the keyboard, and if the key corresponding to the value of Vx is
# currently in the down position, PC is increased by 2.
inst_Ex9E_SKP = (x) ->
  # todo

# #### ExA1 - SKNP Vx


# corresponding to the value of Vx. See section 2.4, Display, for more
# information on the Chip-8 hexadecimal font.
inst_Fx29_LD = (x) ->
  I = x * 5 # as each sprite is 5 bytes and stored at address 0

# #### Fx33 - LD B, Vx

