From: "Will Jennings" <xds_sigma7_at_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.
Received on Thu Jan 30 2003 - 20:47:00 GMT