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Suzy B Software CD-ROM 2 (1994).iso
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checkrtc.doc
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1995-05-02
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Documentation for CHECKRTC
--------------------------
CHECKRTC is a program to check the accuracy of the Real Time Clock
(RTC) on the TT030. It does so by comparing elapsed time as measured
by the RTC, with that measured by the 200Hz system tick counter.
It was written because my TT was losing time, and I wanted to:
a) verify that this happened constantly (rather than e.g. just
at bootup)
b) allow others to check their TTs, and thereby determine if
it was just a problem with my system
c) write some more low-level hardware code.
When CHECKRTC is invoked, it first checks that it's on a TT. If it
isn't, it exits with a message. Otherwise, it saves the current
values of the RTC and the system tick counter, and waits for a
keypress. Pressing the "Esc" key will terminate the program;
otherwise, each time a key is pressed, the current time/date will be
displayed, followed by the elapsed time since the program start, as
measured by the RTC and the system tick counter. If these values
are the same, a message is issued to indicate the limits of accuracy
of the measurement. Otherwise, a message indicates if the RTC is
fast or slow compared to the system tick counter, and by how much
per day. This calculated value will fluctuate somewhat when short
intervals are measured, but should approach a steady value as the
intervals grow longer.
Comments, complaints and compliments to Roger Burrows at one of the
following addresses:
GEnie
Userid: R.BURROWS1
NCAUG BBS (613) 231-3630
Userid: Roger Burrows
Mail: Anodyne Software
6 Cobbler Court
Ottawa
Ontario K1V 0B8
CANADA.
CHECKRTC is copyright ╜ Roger Burrows 1992, but may be distributed
freely provided that both the program and this documentation file
remain unaltered, and are distributed together in an archive.