OSWORD &0F
On entry: XY?0=length of data at XY+1 XY?0=3 Set alarm XY+1=3-byte BCD alarm block XY?0=5 Set from XY+1=5-byte centisecond time XY?0=7 Set from XY+1=7-byte BCD date block, year 1980-2079 XY?0=8 Set from XY+1=8-byte BCD date block with century XY?0=8 Set from XY+1="hh:mm:ss" XY?0=11 Set from XY+1="dd mmm yyyy" XY?0=15 Set from XY+1="DDD,dd mmm yyyy" XY?0=20 Set from XY+1="dd mmm yyyy.hh:mm:ss" XY?0=24 Set from XY+1="DDD,dd mmm yyyy.hh:mm:ss"
The caller should simply store the length of the passed data at XY?0 and store the passed data at XY+1. The caller must not put any interpretation on the data and length it passes, that is entirely the responsibility of the code that implements the call, not the caller.
Data format
The date string format is "DDD,dd mmm yyyy.hh:mm:ss". The punctuation is normally irrelevant, the position of the component values is fixed. BCD date block format: +0 year &00-&99 +1 month &01-&12 +2 date &01-&31 +3 day &01-&07 Sun-Sat or &00 for unsupported +4 hour &00-&59 +5 minute &00-&59 +6 second &00-&59 +7 century &19-&20, if omitted, year is 1980-2079 BCD alarm block format: +0 hour &00-&59 or &C0-&FF for 'any' +1 minute &00-&59 or &C0-&FF for 'any' +2 second &00-&59 or &C0-&FF for 'any'
Implementation
On a system without a Real Time Clock, the MOS passes OSWORD 14 to sideways ROMs for support.
Master MOS
The Master MOS 3 and MOS 4 implements subcalls 8,15,24.
Master Compact
The Master MOS 5 passes all calls to sideways ROMs.
SoftRTC
The SoftRTC module stores the time and date with the system TIME timer. It implements subcalls 7,8,11,15,20,24. The SoftRTC module included in HADFS sets the date with *SETDATE.
I2C Control ROM
RISC OS
Implements subcodes 5,8,15,24. The century is read from the system configuration.
Notes
Have not yet found information to document implementations supporting turning alarm on/off, and reading alarm setting.
See Also
Jgharston 12:57, 26 May 2009 (UTC) Jgharston (talk) 00:16, 7 January 2023 (CET)
