GameShark hardware Cheats for Playstation

Play CD-R discs:

Note: This feature requires a v3.0 GameShark cartridge.
Use a spring or similar object to always keep the PlayStations
lid button depressed. Enter the "Use Enhancement CD"
option in the GameShark menu while a normal PlayStation game is
in the system. It will try to play your disc, but will stop since
it is not an Enhancement CD. A message prompting to press X

will appear. Switch the disc with the CD-R, with the spring keeping
the lid button depressed, then press X
and exit out to
the main menu. Start the game and the PlayStation game will begin
to load.

Note: Creating a copy of a PlayStation disc is considered illegal
unless you also own the original game disc.Message from Gav:

This trick requires the GameShark CDX 3.3. Hold L1
+ L2
+ R1
+ R2
at the main screen. The directions
that scroll at the bottom of the screen will stop and a message
from Gav will appear.
Message from Gavin Thornton:

This trick requires the GameShark version 1.1. HoldL1
+ L2
+ R1
+ R2
at the main screen
to display a hidden message from Gavin Thorton (the programmer)
at bottom, in the scrolling message bar.
Hint: Backup boot disc for CDX:

If you have both a GameShark CDX and a Sharklink (which
comes with a disc), you can use either disc to boot the CDX memory
card.
Frequently Asked Questions

Frequently Asked Questions: CDX disc swapping: by Rowin Mittchell