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From: diamant@hpfclp.UUCP
Newsgroups: comp.os.minix
Subject: Re: Clock setting program for AST Six Pack
Message-ID: <9490005@hpfclp.HP.COM>
Date: Sun, 19-Apr-87 19:25:16 EST
Article-I.D.: hpfclp.9490005
Posted: Sun Apr 19 19:25:16 1987
Date-Received: Sat, 25-Apr-87 03:50:53 EST
References: <771@killer.UUCP>
Organization: HP, Fort Collins, CO
Lines: 56

I have also written an astclock replacement program (for a MegaPlus, but it
probably works the same for the other AST cards).  I also took the port_in
routine the same as Tom.  The compilation command is identical. Tom, mine
is considerably simpler than yours.  There are two main reasons I see for this:

1) You copied the code for date into astclock.  I just called date.
2) You seem to have bullet proofed your code against conditions I don't
   understand (such as why do you need to call the clock twice -- do you
   get garbage back sometimes -- I never have).

Tom, maybe you'd care to comment on why you do as much as you do in your
version.

-------- astclock.c (not shar) -- cut here:

/* Written by:  John Diamant  04/15/1987
   Contributed to the public domain

   This was written for the AST MegaPlus card, but it probably works for the
   other AST cards.

   Should be called in /etc/rc as follows:  "date `astclock`" where path
   information has been deleted.  This only works within the range inputtable
   by date (what happens in 2000?) and will be a few seconds off because of
   the time to call date after astclock returns its answer.  The algorithm
   is also only tested within the years specifiable by date in MS-DOS (the
   way the clock is set on the board), which means 1980-2099.  Since I had
   virtually no documentation for the clock chip, I could only figure out
   the representation for the dates I could set */

#include <stdio.h>
#define CLOCK_PORT 0x2C0
#define SECOND 2
#define MINUTE 3
#define HOUR 4
#define DAY 6
#define MONTH 7
#define Y1 8
#define Y2 9
#define Y3 10

main()
{
	int month, day, year, hour, minute, second;

	port_in(CLOCK_PORT + SECOND, &second);
	port_in(CLOCK_PORT + MINUTE, &minute);
	port_in(CLOCK_PORT + HOUR, &hour);
	port_in(CLOCK_PORT + DAY, &day);
	port_in(CLOCK_PORT + MONTH, &month);
	port_in(CLOCK_PORT + Y3, &year);
	year += 80;

	printf("%02x%02x%02d%02x%02x%02x", month, day, year, hour, minute,
		 second); 
}