RFC (unknown status)
Some Brief Preliminary Notes on the Augmentation Research Center Clock. W.K. English. February 1970. RFC34. (Format: TXT=2534 bytes) (Status: UNKNOWN) (DOI: 10.17487 / RFC34)
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
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 relative time, which is written into one word of core memory, is
simply the contents of a 24 bit binary accumulator. The rate at which
the accumulator is updated can be chosen to be either once very 100
micro seconds or once every millisecond. In either case the core
RFC 34 Prelimary Notes on the ARC Clock February 1970
location is written each time the accumulator is updated. As above the
short-term accuracy will be about 10 to 20 microseconds and the long-
term accuracy will be the equivalent of one second every 250 days.
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Katsunori Tanaka 1/98 ]
Java Enterprise Edition (EE)
Java Standard Edition (SE)
RFC (standard status)
RFC (proposed standard status)
RFC (draft standard status)
RFC (informational status)
RFC (experimental status)
RFC (best current practice status)
RFC (historic status)
RFC (unknown status)
All information of this service is derived from the free sources and is provided solely in the form of quotations.
This service provides information and interfaces solely for the familiarization (not ownership) and under the "as is" condition.
Copyright 2016 © ELTASK.COM. All rights reserved.
Site is optimized for mobile devices.
Downloads: 141 / 158770758. Delta: 0.00257 с