I thought I'd posted here (either I didn't click "Post", or I'm going senile?).
Anyway, I tried the Gameshark support with three games, and two of them didn't work. The third might have worked, but I'm not sure.
The games are:
Perfect Dark (E)
I tried using the following, which allows you to toggle on and off (via Left Shoulder Button and D-Pad Down) the Combat Boost at any time
D109A040 0020
8009A977 0001
D109A040 0020
8109A96E 01F4
The N64 just locks up on the screen where your OS says it's loading the game (the screen doesn't change from your loading message).
Duke Nukem: Zero Hour (E)
I tried using the invincibility code (from
http://www.kai666.com/games/duke_nuke_zero.htm)
800DF203 0001 Enable Invincible mode
But the game loads, then stops with "The Game is Not Designed for this System."
Duke Nukem 64 (E)
I tried the following, to enable the in-game cheat menu (
http://www.kai666.com/games/duke_nuke_64.htm)
50000504 0000 Enable Cheat Menu
80101308 0001
and it might have worked, I don't know, as it did enable the menu, but didn't allow me to select anything from the menu.
All of the games, and my N64, are PAL, and the n64has a 4MB expansion pak attached. Regarding your OS's menu, why does it flash every time the selection bar is moved up or down? And whey you view the 'About' page, how do you get back to the main menu, please?