[time-nuts] 60Hz mains clocking in computers

[Stanley Reynolds]

Not Linux but cpm,

I think the poly 88 a 6 slot s-100 computer used the mains for the RTC that is a diode from the secondary of the main power transformer to an interrupt on the processor a 8080.

Sure that was used for other computer Real Time Clocks but don't remember any processor clock based on the mains.

Stanley


----- Original Message ----
From: Colby Gutierrez-Kraybill <colby at astro.berkeley.edu>
To: time-nuts at febo.com
Sent: Sat, December 12, 2009 7:29:17 PM
Subject: [time-nuts] 60Hz mains clocking in computers


I'm trying to get to the bottom of whether or not any computing equipment made around the advent of UNIX systems (or any time-slicing system) used the mains cycles of 60Hz as phase lock for the internal system clock.  My guess is that perhaps they did not as the computing logic is DC based, but, I have memories of using an 68000 based UNIX system that I thought had its internal clock based off of the 60Hz mains...  Not sure the vendor anymore.

Thanks,  Colby


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