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