30 Jan
2003
30 Jan
'03
12:47 p.m.
From: "Will Jennings" <xds_sigma7(a)hotmail.com>
Can anyone tell me if this board is supposed to have a crystal or something
plugged into it? It has this little 2-hole socket-type thing on it, but
without looking at others, I cannot tell if there is something that belongs
there... This is part of some variation of the KW8I clock, FYI.
The two pin connector on the edge goes to a transformer on the bottom of
an 8/I to the left of the fans. It is a schmitt trigger to convert your line
frequency into a clock pulse for the real time clock.
If you need a picture I can take one.
The schematic is in the 8/I maintenance manual I have online, pg II-57, volume
II.
David Gesswein
http://www.pdp8.net/ -- Run an old computer with blinkenlights.