X1226_REG_Y2K
dt->dt_year += bcdtobin(bcd[X1226_REG_Y2K - X1226_REG_RTC_BASE]
bcd[X1226_REG_Y2K - X1226_REG_RTC_BASE] = bintobcd(dt->dt_year / 100);
#define X1226_REG_RTC_SIZE ((X1226_REG_Y2K - X1226_REG_RTC_BASE) + 1)