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Some Brief Preliminary Notes on the Augmentation Research Center Clock (RFC0034)

IP.com Disclosure Number: IPCOM000003531D
Original Publication Date: 1970-Feb-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 2 page(s) / 2K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W.K. English: AUTHOR

Related Documents

10.17487/RFC0034: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 67% of the total text.

Network Working Group Bill English SRI/ARC Request for Comments No. 34 26 February 1970

SOME BRIEF PRELIMINARY NOTES ON THE ARC CLOCK

The ARC clock system provides a time reference that is written into the core memory of the XDS 940 Computer. There are two types of time information available--absolute and relative.

The absolute time is written into two adjacent words of core with the following format:

First word --

Bits 0 thru 7 contain the month code in straight binary with a range of 1 to 12

Bits 8 thru 15 contain the day code in straight binary with a range of 1 to 31

Bits 16 thru 23 contain the year code in straight binary with range of 0 to 99

Second word --

Bits 00 thru 7 contain the hour code written in straight binary with a range of 0 to 23

Bits 8 thru 15 contain the minute code written in straight binary with a range of 0 to 60

Bits 16 thru 23 contain the second code written in straight binary with range ofr 0 to 60

These 2 words are written once each second. It is anticipated that the accuracy of the initial setting will be on the order of 1 second, as referred to WWV, and that the oscillator drift rate will not account for an accumlated error of more than 1 second every 250 days. The oscillator and clock are provided with standby power in order to maintain the accuracy of the system. Because of variable delays in time required to obtain access to the 940 core memory, it is anticipated that the short-term accuracy will be on the order of 10 to 20 microseconds.

The...

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