What are COP1 Registers?
The COP1 registers, also known as Floating Point (FP) registers, are used for floating point calculations. These regs are referenced as F0, F1, etc up to F31. No Dollar signs with them, and Niew doesn’t show them, as it doesn’t support COP1 opcodes. Some examples of these would be Size mods, Coordinates, some Timers, some Health & Ammo, etc. These FP regs can only be viewed when using Nemu. If you need to know what they are when hacking GSCC2k2, the only thing you could really do is write a long ASM routine to store the values of the FP regs to some emtpy RAM. FP numbers in RAM are stored as 32bit values. If you’ve ever played with a Bond game, you’ve seen them. Bond’s health (3F80/42C8) was an FP. You’ll notice in the Bond case, that your full health is 3F80 0000, but obviosly you only need to freeze the upper half (3F80) to get Infinite Health. What exactly is 3F80? 3F800000 is actually 1.0 and 42C80000 is 100.0. How can you calculate those?
