DEC M501 board

From: David Gesswein <djg_at_drs-esg.com>
Date: Thu Jan 30 20:47:00 2003

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

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