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→IPS and UPS
UPS works just like IPS, though it doesn't have the 16MB ROM size limitation. Not as nearly as common and supported though, aside from GBA projects.
Due to how UPS and IPS work, assuming many patches alter different things (as in, they don't conflict and modify the same areas in the ROM) and work on the same base rom, you can apply them in succession. For example, a patch changing only the character sprites, and another changing only the text, should be okay to apply in succession. It's a very bad idea to apply two patchs altering the same thing unless you know it's a fix (like a change to an ugly font or a nasty bug). Avoid applying in succession two patches which both change the programming and/or re-arrange the ROM contents (example: more than one fan-translation or hack), since they will conflict. Just use common sense.
===Emulators Supporting IPS/UPS patching on the fly===
