N64 Code Types

80 : Default, used for ”regular” 8-bit codes
      (Compatible with the X-Plorer 64)

81 : Used for 16-bit codes initializing all four digits
       (Compatible with the X-Plorer 64)

88 : Default AR-button, used to activate the code by pressing the AR-button
      (NOT compatible with the X-Plorer 64)

89 : Same as above, only the code will be activated by AR-button
      (NOT compatible with the X-Plorer 64

50 : AR Pro version 3.x ONLY, Patch Code, to make a code string shorter. 
     (5 codes put together to give you  “all  weapons”)   
     (Compatible with the X-Plorer 64 Version 1.067 ONLY)

CC :  All CC, DD and EE codes are like EE000000 0000,. These codes
DD : Disables the Expansion-Pak (if you have one fitted in your Nintendo 64)
EE : (Compatible with the X-Plorer 64)

D0 : 8-bit Equal to “Activator”. When the given address reaches the Supplied value, activate the
      following code
      (Compatible with the X-Plorer 64) 

D1 : Action Replay / Equalizer version 3.x ONLY, 16-bit Equal to “Activator”. Same as above,
       only the address needs all 4 digits to be equal to the supplied value.
       (Compatible with the X-Plorer 64)

D2 : 8-bit Different to “Activator. When the given address is different to the value on this code, activate
      the following code.
      (NOT compatible with the X-Plorer 64) 

D3 : AR Pro 3.x ONLY. 16-bit Different to “Activator” . When the given address is different to the value
       on this code, activate the following code.
       (NOT compatible with the X-Plorer 64)

DE : AR / EQ 1.08+ ONLY. Tells the Cheat device where the value “3C0880” is in the RAM.
       This type of code does not write a value to the given address.
       (Used by the X-Plorer 64 only for a (M) Must Be On Code

2A : Used by the X-Plorer 64 ONLY for a (M) must Be On Code.

3C : Same as above only this, (M) Must Be On Code, requires a specific Boot Mode.

F0 : Tells the Action Replay what address is causing the malfunction with it, and writes the supplied
       value to that address. This is in 8-bit mode.
       (NOT compatible with the X-Plorer 64)

F1 : Same as above, only this is in 16-bit mode.
        Used by the Action Replay / Equalizer for a (M) Must Be On Code
        (NOT compatible with the X-Plorer 64)

FF : Sets the address in memory where it stores the codes that are currently on.
      Used by the Action Replay / Equalizer for a  (M) Must Be On Code.
      (NOT compatible with the X-Plorer 64)

      Source: The former Action Replay Headquarters and / or 
      www.all-xplorer.com/faqN64CodeTypes.html

Edited by kai666.com N64 PAL codes 
24 - 08 - 2004