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-
- CLOCK
- For Commodore 128 CP/M Plus
- Version 1.1
-
- Gene Pizzetta
- December 6, 1987
-
-
- CLOCK is a utility to read "The Right Time" clock-calendar and
- set the system time and date under CP/M Plus on the Commodore
- 128. The current time and date is also displayed at the console.
-
- USAGE:
-
- CLOCK
-
- No parameters are needed on the command line.
-
- Put the CLOCK command in your PROFILE.SUB and the CP/M system
- time and date will be set automatically everytime you boot up.
- Your disk file date stamping will always be correct. If you use
- MAKE+ to compile or assemble programs, it will always work
- correctly, even if you are crashing the system every 10 or 15
- minutes testing a buggy program.
-
- CLOCK has one small bug. When you call CLOCK from the CP/M
- command line, if the system time was previously set to a time
- later than the real time that the clock provides, the date will
- be advanced a day by the warm boot. The apparent reason for this
- is that when the BDOS or CCP checks the time and finds it is
- earlier than the last time it checked, it is assumed that a new
- day has arrived and that the date should be incremented. I don't
- know a way around this, but there may be a flag somewhere that I
- haven't found yet. This situation should be a rare occurrence
- for most people. In any case running CLOCK a second time will
- set the date correctly.
-
- THE RIGHT TIME CLOCK: The Right Time is a trademark of Ardelt
- Engineering Company for their battery-backed clock-calendar for
- the Commodore 64 and 128. The clock plugs into the User Port
- and, if you use a 1670 modem, it will plug into the back of the
- clock. The RTC does not interfere with any CP/M functions,
- including Drive M: (the RAM disk). You can get more information
- from:
- Ardelt Engineering Company
- 8175 East 39th Avenue
- Denver, CO 80207
- (800) 237-2943 for orders
- (303) 355-1763 for technical information
-
- SOURCE CODE: The source code is pretty well commented
- throughout. If you want to make some changes, you should not
- have any trouble figuring out what's going on at any point.
-
- Much of this code is not original. For the clock reading
- routines I relied heavily on the C-128 native mode driver written
- and copyrighted by Stephen Ardelt of Ardelt Engineering,
- manufacturers of The Right Time clock-calendar. The most
- important changes were translating 6502 code to Z80 code and
- using Z80 "in" and "out" instructions to access the I/O chips,
- which are not visible in the banks in which CP/M operates (0 and
- 1).
-
- Most of the subroutine to put the date in DRI format was taken
- from UNDATE.ASM, a procedure written by S. Kluger of the El Paso
- RCP/M. It is in the public domain. The original routine was
- written to read the time and date as ASCII strings, so it was
- modified to accept binary input.
-
- CLOCK was developed using SLRMAC, SLR Systems miraculous
- assembler. The source file can be assembled with MAC and HEXCOM,
- however, by changing the filetype from .MAC to .ASM. MAC will
- also require that you have Z80.LIB on the default drive.
-
- (Note that MAC will generate a meaningless error when it finds a
- line with an exclamation point in a comment. Ignore the error;
- the generated code will be fine.)
-
- HISTORY: For the two and a half years that I've been using my C-
- 128 I've been thinking how nice it would be to have a battery-
- backed clock like those available for MS-DOS machines. It does
- get a little tiresome entering the date and time on every boot
- using DATE.COM, especially when I'm working on a machine language
- program that keeps crashing the system.
-
- About a year ago I heard about a clock that used the Expansion
- Port (where the RAM expansion goes), but another CP/M user
- reported that it interfered with the RAM disk, so I considered it
- no longer. More recently I read about Ardelt Engineering's Right
- Time clock that plugged into the User Port (where the modem
- goes), so I called them to find out about it. Stephen Ardelt
- assured me that his clock would not interfere with the CP/M in
- any way, but that driver programs were included only for 64 and
- 128 modes. He suggested that it shouldn't be particularly
- difficult to write a CP/M utility to read the clock. I bit and
- he was right on all counts.
-
- Version 1.0 -- December 5, 1987 -- original version. It reads
- and it sets!!!
-
- Version 1.1 -- December 7, 1987 -- Added date and time display to
- console.
-
- Please report any bugs or make any suggestions to me by mail,
- phone, or modem:
- Gene Pizzetta
- 481 Revere Street
- Revere, MA 02151
- Voice: (617) 284-0891
- CompuServe: 72060,505
- GEnie: E.Pizzetta
- Q-Link: GeneP
-
- "The Right Time" is a trademark of Ardelt Engineering Company.
- "Commodore 64" and "Commodore 128" are trademarks of Commodore
- Electronics Ltd. "CP/M" and "CP/M Plus" are trademarks of
- Digital Research Inc.