gistfile1.txt

// internal register cache, copy on write
#define YM_REG_LAST_ADDR 0xB4
#define YM_REG_FIRST_ADDR 0x22
#define YM_REG_PART_SIZE (YM_REG_LAST_ADDR - YM_REG_FIRST_ADDR + 1)  
#define YM_REG_NUM_PARTS 2
uint8_t registers[YM_REG_NUM_PARTS][YM_REG_PART_SIZE];


void Ym2612::set_register(uint8_t part, uint8_t ym_addr, uint8_t value)
{
    this->registers[part][ym_addr - YM_REG_FIRST_ADDR] = value;
    write_register(part, ym_addr, value);
}
uint8_t Ym2612::get_register(uint8_t part, uint8_t ym_addr)
{
    return this->registers[part][ym_addr - YM_REG_FIRST_ADDR];
}