READ CALENDAR
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BIOSF_READ_CALENDAR ($C0045C)
Helper function which reads the uPD4990 calendar date and time in RAM. MVS only. Sets in BCD:
| Address | DEF name | Size | Set by | Description |
| $10FDD2 | BIOS_YEAR | byte | BIOS | Current year |
| $10FDD3 | BIOS_MONTH | byte | BIOS | Current month |
| $10FDD4 | BIOS_DAY | byte | BIOS | Current day |
| $10FDD5 | BIOS_WEEKDAY | byte | BIOS | Current weekday (Sunday = 00, Monday = 01 ... Saturday = 06) |
| $10FDD6 | BIOS_HOUR | byte | BIOS | Current hour (24h format) |
| $10FDD7 | BIOS_MINUTE | byte | BIOS | Current minute |
| $10FDD8 | BIOS_SECOND | byte | BIOS | Current second |