[time-nuts] Spectracom 8170 -> SWCC clock
Jim Hickstein
jxh at jxh.com
Thu Mar 1 21:18:55 UTC 2012
On 2012/02/22 13:48, Jim Hickstein wrote:
>> What are the chances my EEPROMs would DTRT if I just added an 8255A to this
>> board?
They do. Socket and 8255A added, signals present on the 50-pin header as
documented for Option 18, so I'm proceeding with my little TTL circuit to set
the SWCC clock on the hour. (Contact me privately if you want criticize my
schematic. I'd love to get some help with that, as I haven't done this kind of
thing for decades. I'm an Extra, but not an EE.)
This (image) is the 1PPS and seconds-LSB signal, over two seconds. Sorry for
the focus. I could get out the better camera for this, I suppose. Digikey
order arrived today. Whee!! Now I just have to see if I still remember which
end of a 14-pin DIP is "up". (Joke! Some things you just cannot forget, even
after decades.)
Digikey had everything I needed except the 40-pin DIP package of the 8255A. But
I easily found one on eBay. That makes it an antique. Copyright 1975.
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