Newsgroups: comp.sys.apple2 Subject: Re: IIE SELF-TEST: Which ram is bad? error code From: dempson@actrix.gen.nz (David Empson) Date: Fri, 13 Nov 1998 02:37:51 +1300 Message-ID: <1dieup6.p5mxc51l1gqqN@dempson.actrix.gen.nz> References: <72ds7n$bsg$1@lynx.unm.edu> Organization: Empsoft X-Newsreader: MacSOUP 2.3 NNTP-Posting-Host: 202.49.157.176 X-Trace: 13 Nov 1998 02:36:24 -1300, 202.49.157.176 Lines: 28 Path: news1.icaen!news.uiowa.edu!uunet!in5.uu.net!nntprelay.mathworks.com!Supernews60!supernews.com!ihug.co.nz!news.iprolink.co.nz!news.actrix.gen.nz!dempson Xref: news1.icaen comp.sys.apple2:141703 stephen e buggie wrote: > I've been give three junked IIe motherboards. (Mrs. Buggie does not yet > know it ... > The third is now enhanced, and this RAM error message appears on the > self-test screen: > > R A M 0 0 0 0 0 0 0 1 > > This message clearly states that one of the motherboard eight RAM chips is > bad, and that it is either the first or last of the eight. But _which > one_? The comments in the IIe firmware listing imply that the bits are listed in the "normal" order, i.e. most significant on the left, least significant on the right. The faulty chip is therefore the one containing bit 0. This is UF6 according to the circuit diagram. > The left-most RAM chip is labeled on the front edge of the m-board as #6, > and the right-most RAM is #13. That corresponds to the circuit diagram. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand