RTCSB_24HR
if (rtc->reg_b & RTCSB_24HR) {
if ((rtc->reg_b & RTCSB_24HR) == 0 && ct.hour >= 12)
if ((rtc->reg_b & RTCSB_24HR) == 0) {
if ((rtc->reg_b & RTCSB_24HR) == 0) {
rtc->reg_b = RTCSB_24HR;
rtcout_locked(RTC_STATUSB, RTCSB_24HR);
rtcout_locked(RTC_STATUSB, RTCSB_24HR);
rtcout_locked(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
static u_char rtc_statusb = RTCSB_24HR;