typedef struct MMU {
    unsigned char padding;
    unsigned char mode;
    unsigned char rootpage;
    unsigned char childpage;
    unsigned int childoffset;
    unsigned int rootoffset;
    unsigned int len;
    unsigned char special;
    unsigned char crystal;
    unsigned char sleep;
} MMU;
MMU* mmu = (MMU*)0x300;
void set_clock_multiplier(unsigned char value){
    rb_map_device(0);
    mmu->crystal = 33;
    mmu->crystal = 41;
    mmu->crystal = value;
    //rb_unmap();
}