No luck on the 2x walking problem. Klaviaturist, thanks for all the notes while testing the codes. I'm going to put the codes on my site, but with a warning.
Since I'm working on Phantasy Star 3, I've decided to make some more Game Genie codes.
Open treasure chests as many times as you want (you can keep getting an item or
money over and over).
Get the Ceramic Knife (instead of the regular Knife) in the left chest in the
Landen dungeon. Code must be turned on before you're escorted into the dungeon.
Get the Steel Sword (instead of the Knife) in the left chest in the Landen
dungeon. Code must be turned on before you're escorted into the dungeon.
Get the Nei Sword (instead of the Knife) in the left chest in the Landen dungeon.
Code must be turned on before you're escorted into the dungeon.
hugues, I also have the ROM address so you can change what you get from the Right chest if you want it. I didn't make any GG codes for it because it looks like the Monitor is a required item, and I'm not sure if you can get it anywhere else or not.
Also, the "Walk thru walls" code might be a good addition to your program. It doesn't appear to have any unwanted side effects (although not thoroughly tested), and can be turned on or off at anytime during the game.
Below is the ROM address for changing the character's carrying capacity. I tried increasing it to 20 items (normally, you can only carry 15 items), and it does work, but there are problems that will need to be fixed. I used the "Open chests as many times as you want" code and was able to carry 20 items. When I go to the "items" screen, I couldn't directly see them, but I could select them and it gave me the option to Use, Give, or Discard.
One problem is that the addresses in RAM that it uses for the extra items, are most likely the RAM addresses for your next character's items. This will cause problems with that character, but I was reading (on Gamefaqs) that you can do a "Solo" quest. In that case, it may not matter if your other character's items are messed up.
Also, you can make it so that your character can carry less items to make the game more challenging. There would probably be no problems with this type of hack.
One other note, I've only tested the modification when getting items from chests. I don't know yet if shops use the same routine when you get items.
Anyways, here's the ROM address for carrying capacity: $01804A. The value there is 001E. 1E = 30 in decimal. Each item counts as 2, so 15 x 2 = 30. If you want to carry 20 items, 20 x 2 = 40, 40 converted to hex = 28. Change the 001E to 0028 in the ROM.
Again, some things need to be worked out, but maybe someone can spend some time figuring it out.