Path: utzoo!utgpu!water!watmath!clyde!att!alberta!ubc-cs!uw-beaver!cornell!batcomputer!itsgw!steinmetz!uunet!jetson!susan
From: susan@jetson.UPMA.MD.US (Susan Prothro)
Newsgroups: comp.arch
Subject: Re: real time clock chips
Keywords: real-time-clocks parts
Message-ID: <106@jetson.UPMA.MD.US>
Date: 19 Aug 88 18:34:00 GMT
References: <91@jetson.UPMA.MD.US> <1263@ficc.UUCP>
Organization: SMART HOUSE Limited Partnership
Lines: 25

In article <1263@ficc.UUCP>, peter@ficc.UUCP (Peter da Silva) writes:
> This is, of course, a time-of-day clock. A real-time clock is a circuit
> that provides precisely timed interrupts to the CPU. Wasn't it IBM that
> first came up with this particular misnomer?

Oh, of course.......

Please refer to the Hitachi manual, "8/16-Bit Multi-Chip Microcomputer
Data Book," pg.668.  On this page is a chapter entitled, "HD146818 RTC
(Real Time Clock Plus RAM)."
 ^^^^^^^^^^^^^^^
In addition to providing *some* of the time-of-day features that I am 
seeking, this part is described as providing three "precisely timed"
interrupts which can be set to various intervals.  (I am also seeking this
feature, which is why I asked about real-time clocks.)

Also, I would very much like to thank the three gentlemen who were not
confused by my posting: Per Fogelstrom, Phil Kos and Greyham Stoney.
The information you have provided has been very useful.  

To all others: I am still seeking chip information.  Perhaps I
shouldn't post to this newsgroup when I am seeking information; it
seems to be reserved for "nit-picking" and philosophical discussions.

	- Susan Prothro