Newsgroups: comp.sys.apple2 Subject: Re: IIe no-slot-clock: battery replacement? From: dempson@actrix.gen.nz (David Empson) Date: Wed, 13 Jan 1999 03:19:38 +1300 Message-ID: <1dljucj.kj0xt4ozaa7iN@dempson.actrix.gen.nz> References: <77arda$o42$1@lynx.unm.edu> <3699EB80.8DA4F9DF@EuropeM01.nt.com> <77e85t$1sdi$1@news.gate.net> Organization: Empsoft X-Newsreader: MacSOUP 2.3 NNTP-Posting-Host: 202.49.157.176 X-Trace: 13 Jan 1999 01:11:03 -1300, 202.49.157.176 Lines: 41 Path: news1.icaen!news.uiowa.edu!NewsNG.Chicago.Qual.Net!128.174.5.49!vixen.cso.uiuc.edu!logbridge.uoregon.edu!su-news-hub1.bbnplanet.com!lsanca1-snf1!news.gtei.net!news.netgate.net.nz!news.xtra.co.nz!news.iprolink.co.nz!news.actrix.gen.nz!dempson Xref: news1.icaen comp.sys.apple2:144000 David Wilson wrote: > louiss@gate.net (Louis Schulman) writes: > >I may be mistaken, but isn't the NSC just a Dallas Smartsocket? > > It is actually a SmartWatch - the SmartSocket goes under a RAM chip and > turns it into NVRAM. The SmartWatch goes under a ROM and just provides time. > There is one that goes under a RAM and provides time and NVRAM as well. The one that goes under a RAM is also called a SmartWatch. There are several different models. The letter suffix indicates the chip size and type. Here is a full list from Dallas Semiconductors' 1989 data book: DS1216 SmartWatch/RAM 16/64K DS1216C SmartWatch/RAM 64/256K DS1216D SmartWatch/RAM 256K/1M DS1216E SmartWatch/ROM 64/256K DS1216F SmartWatch/ROM 64/256K/1M The capacities refer to bits, not bytes. The different sizes are required because various static RAMs and ROMs are different sizes and have the power supply pins in different places. In the case of the No Slot Clock, you need a DS1216E to replace it. In <3699EB80.8DA4F9DF@EuropeM01.nt.com>, Robert Lacoste writes: >Even if you find a way to change the battery, do you think it will pass >the Y2K bug ? Dallas Semiconductor posted a Y2K statement on their web site about this. I haven't read it myself, but I believe it states that all their timekeeper products are Y2K compliant, and will operate correctly up to the year 2099. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand