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- GT_OSD - Identifies Operating system and Date/time protocol
- RDCLK - Read the system clock, return packed BCD YYMMDDhhmmss
- TIME - Read the system clock, return ASCII date/time string
- ASCIDT - Convert BCD standard date/time to formatted ASCII
- :
- GT_OSD Identifies Operating system and Date/time protocol
-
- Returns a pointer to a data structure which contains
- DOS identity, CPM compatibility, DOS version, and
- data for system clock access. A separate entry (RDCLK)
- provides for reading the clock.
-
- CALL WITH: (no calling parameters)
-
- RETURN WITH:
- CY set = unknown operating system
- Cy clear = CP/M, CPM+, ZRDOS, ZSDOS, or ZDDOS
- and System Clock set up for date/time access.
- HL -> OS data structure
-
- public gt_osd
-
- SEE NEXT SCREEN for data structure
-
- The data structure to which HL points is:
-
- offset size description
- 0 1 CP/M version with which the DOS is compatible
- 1 1 DateStamper Flag, 'D' for DS, else 0
- 2 1 Version number of the current DOS
- 3 1 Byte value identifying current DOS
-
- 4 1 Value passed in C for DOS clock calls
- 5 2 Address of the Clock read routine (may be BDOS)
- 7 2 Address of the local Date/Time buffer.
-
- DOS identifying values (offset 3, above), all are ASCII
- 0 (binary null) = Unidentified DOS
- C = CP/M M = MP/M O = ZOS
- R = ZRDOS S = ZSDOS D = ZDDOS
- 3 = CP/M+ (=CP/M 3.0)
-
-
- :
- RDCLK - routine to read the system clock
-
- Reads system clock if present. Calls GT_OSD if necessary
- to identify the Clock calling parameters. Compatible with
- ZS/ZDDOS, DATESTAMPER, and CP/M+. Implementer can install
- other clock access routines after a call to GT_OSD.
-
- CALL WITH: (no parameters)
- RETURN WITH:
- NC = NO CLOCK
- CY set = clock has been read
- HL -> date/time buffer, 6 bytes
- For CPM+, the first byte is undefined. Bytes 1,2 contain
- the number of days since 1 Jan 1978. Bytes 3 - 5 contain
- bcd hours, min, sec. (same as ZSDOS). For ZSDOS, ZDDOS,
- and DATESTAMPER, the first three bytes are Year, Month,
- and Day. All are in BCD. Year is last two digits.
-
- public rdclk
-
- :
- TIME - Read the system clock, return ASCII date/time
-
- Uses the general purpose RDCLK routine to get the clock data,
- then converts it to an ASCII string in y/m/d h:m:s format.
-
- CALL WITH: (no calling parameters)
-
- RETURN WITH:
- HL -> the ASCII date/time string
- FLAGS: C = valid null terminated D/T string
- NC = no clock, string starts with null
-
- entry time
-
- :
- ASCIDT - Convert BCD standard date/time to formatted ASCII
-
- Standard packed BCD input string is yy mm dd hh mm ss format.
-
- Produces an ASCII string like yy/mm/dd hh:mm:ss which is null
- terminated. The formatted string is in the more familar form:
- mm/dd/yy hh:mm:ss
-
- CALL WITH:
- HL -> BCD date/time in standard form
- RETURN WITH:
- HL -> Formatted ASCII Date/Time string
- the string is null terminated
-
- entry ascidt
- ext ma2hc
-
-