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Path: utzoo!utgpu!water!watnot!watmath!dalcs!silvert
From: silvert@dalcs.UUCP
Newsgroups: comp.sys.atari.st
Subject: Clock functions on boot
Message-ID: <2445@dalcs.UUCP>
Date: Sat, 14-Mar-87 13:54:03 EST
Article-I.D.: dalcs.2445
Posted: Sat Mar 14 13:54:03 1987
Date-Received: Sun, 15-Mar-87 04:18:26 EST
Organization: Marine Ecology Lab.
Lines: 21
Keywords: XBIOS, GEMDOS, gettime(), keyboard clock, modula-2

I didn't get too much useful response to my query about clocks, so I
fiddled about on my own, and this is what I found out -- these results
were obtained with TDI/Modula-2 Vers. 2 (Have ordered Ver. 3 and am
waiting...) -- they MAY apply to ASM calls and C as well.

When the system is turned on, the date returned by the XBIOS call, which
I think accesses the keyboard clock, is $6000 (6000H or 0x6000,
depending on your language), and the time is $0000.  The system date
returned by the GEMDOS call is $0B74, or 85/11/20, which is presumably
what sets the default clock.  After booting, both clocks read the same.
If you reboot, the value in the clocks depends on whether you have a
control panel installed, etc.  I find that the keyboard clock tends to
come back with $0ABD, which is 85/5/29.  Anyway, I find th whole thing
really confusing.  Could someone clarify how these clocks are set and
reset, and what affects what?  This experimental approach to
documentation is a real pain.
-- 
Bill Silvert
Marine Ecology Laboratory, Dartmouth, NS, Canada
CDN or BITNET: silvert@cs.dal.cdn	-- UUCP: ..!{seismo|utai}!dalcs!silvert
ARPA: silvert%dalcs.uucp@seismo.CSS.GOV	-- CSNET: silvert%cs.dal.cdn@ubc.csnet