We are restoring a CBM-900 prototype coomputer in datamuseum.dk.
The CBM-900 ran Mark-Williams "Coherent" UNIX clone.
Here are some quotes from the manuals, for enlightenment and amusement.
------------
Changing the time zone
If you are not in the Greenwich time zone, you should change
the file "/etc/profile" to specify your time zone. [...]
To use timezone, you must give the names of your standard
and daylight-savins time zones, and the location of your
time zone in minutes west of Greenwich, England. For example
the command
TIMEZONE=EST:300:EDT
tells the COHERENT system that your standard time zone is Eastern
Standard Time (EDT), your daylight-savings time zone is Eastern
Daylight Time (EDT), and that you are located 300 minutes west of
Greenwich.
Note that the term "minutes west" refers to minutes of time, not
minutes of longitude. To calculate how many minutes of time your
city is west of Greenwich, multiply its degrees of longitude by
four; for example, Chicago is located 88 degrees west, which
means that it is 352 minutes (5 hours and 52 minutes) west of
Greenwich "in time". If you are unsure of the longitude of your
city, check any atlas.
------------
date -- Print the date
The COHERENT system keeps track of the time and date [...]
Internally, the date and time is kept in seconds since January 1,
1970 at 00:00:00 GMT. This means that files created in one time
zone and referenced in another time zone, will bear the correct
time. The time and date printed out is converted from the internal
form to local time.
------------
[discussion of TIMEZONE variable]
For example, possible TIMEZONE settings for Central Standard Time
are:
TIMEZONE=CST:360
TIMEZONE=CST:360:CDT
TIMEZONE=CST:360:CDT:-1.1.4:-1.1.10
TIMEZONE=CST:360:CDT:-1.1.4:-1.1.10:2:60
The first setting provides conversions to standard time only, a
convention used by many farmers. The last three settings provide
conversions to daylight time and specify the default conversion
rules in increasing detail.
------------
[...] stime sets the system time. [...] which contains the number
of seconds since midnght GMT on January 1, 1970.
------------
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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