READ CALENDAR

BIOSF_READ_CALENDAR ($C0045C)
Reads the uPD4990 calendar and sets values in RAM. MVS only. Sets in BCD:


 * BIOS_YEAR ($10FDD2): last 2 digits of year
 * BIOS_MONTH ($10FDD3): 1~12
 * BIOS_DAY ($10FDD4): 1~31
 * BIOS_WEEKDAY ($10FDD5): Sunday = 0... Saturday = 6
 * BIOS_HOUR ($10FDD6): 0~23
 * BIOS_MINUTE ($10FDD7): 0~59
 * BIOS_SECOND ($10FDD8): 0~59