piclist 1999\10\23\071942a >
Thread: 6818 calendar IC
www.piclist.com/techref/index.htm?key=6818+calendar
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<DIV><FONT size=2>Hi everyone, I'm new to the group today. So far finding
the</FONT></DIV>
<DIV><FONT size=2>exchange of comments and information interesting and
useful.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT size=2>Just a short introduction - 43yo male, Auckland, New
Zealand</FONT></DIV>
<DIV><FONT size=2>Basic self-employment is electronic and uC design as well
as</FONT></DIV>
<DIV><FONT size=2>technical consultant to Auckland Inventor's Society.
Member</FONT></DIV>
<DIV><FONT size=2>of Mensa NZ, ageing hippy with a Peter Pan complex who
lives</FONT></DIV>
<DIV><FONT size=2>to experiment. Very wide tastes in all things as long as
they're</FONT></DIV>
<DIV><FONT size=2>not middle-of-the-road, ie I like the best and the worst
IYKWIM.</FONT></DIV>
<DIV><FONT size=2>As I've been in this caper since 1975 I hope my experience
can</FONT></DIV>
<DIV><FONT size=2>be of help to someone at some time.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT size=2>In the mean-time ;</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT size=2>Wondering if anyone has, or can point me to, code to
operate<BR>an MC6818 calendar chip, as found in many PCs. They aren't<BR>as
common in new machines but I have many old motherboards<BR>with them on, either
as a plain 6818 or made up as a Dallas<BR>package (which includes the external
crystal). I tried last year<BR>to read/write the registers in the 6818, but
could only succeed<BR>in reading some data that sort of looked OK, but attempts
to<BR>write to the chip, eg to set the time or use the free RAM area,<BR>were
unsuccessful. In fact I think I even destroyed one. There's<BR>a note in the
data sheet about the whole chip turning into some<BR>mega Zener diode if certain
conditions aren't met. It did get very<BR>hot and I'm sure it's poked. Luckily
it's only one of many (still<BR>a shame to nuke a chip anyway even if was free).
As someone<BR>who takes a special interest in clock circuits I'd like to sort
this<BR>one out. Any help gratefully received.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT size=2>regards, Joe Colquitt</FONT></DIV>
<DIV>&nbsp;</DIV>
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