JP scroll glitch

The JP Scroll Glitch is a bug in Final Fantasy Tactics that allows the user to gain 9999 Job points in any job class where the abilities span more than one page.

How to Use
To exploit this glitch earn enough JP to get the Action Ability that costs the least JP in the job you wish to master, and go to the "learn ability" screen. Then select an ability you can get. BEFORE you choose yes hold the button and press the down button and release the  button. If the ability highlighted is a)darkened (e.g.you don't have enough JP) or b) already owned select yes. You should have 0 JP. Back out to the charecter select screen then go back to the learn ability screen. You should have 9999 JP.

Why It Works
The square button in the ability menu works in a way similar to the "page down" on your computer. During programing the normal scrolling was disabled when an ability is selected but the page down scrolling was overlooked. When you go to an ability with more JP than you have it registers as a number less than zero. It registers this as an overflow glich and sets the value to the maximun.

Problems
There are certain classes that don't have more than one page of abilities: they are Archer, Bard, Calculator, Divine Knight, Dragoner, Engineer, Heaven Knight, Hell Knight, Holy Knight, Knight, Mime, Monk, Soldier, Squire(not including Ramza after chapter 4), and Thief. The wizard class presents a problem as one page from a level one spell is another level one spell. To avoid this put the level one spell you can learn on the bottom of the page.