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- Path: sparky!uunet!haven.umd.edu!umd5!mac40-pg2.umd.edu!user
- From: de19@umail.umd.edu (Dana S Emery)
- Newsgroups: comp.sys.mac.hardware
- Subject: Re: Help on repairing Mac SE, please!
- Message-ID: <de19-250792155117@mac40-pg2.umd.edu>
- Date: 25 Jul 92 19:59:12 GMT
- References: <1992Jul22.120300@beanpot.ma30.bull.com> <1992Jul23.152346.13475@gateway.novell.com> <894@telxon.UUCP>
- Sender: news@umd5.umd.edu
- Followup-To: comp.sys.mac.hardware
- Organization: Personal
- Lines: 28
-
- In article <894@telxon.UUCP>, joes@telxon.uucp (Joe Staudt) wrote:
- >
- > >: 1) Does the checkerboard with happy Mac indicate something else?
- > >
- > >It can but in this case it is due to a bad memory address map... you took out
- > >1 meg simms and put smaller ones in, but did you make sure the resistor that
- > >lets the machine know what kind of simms are in was correct, and did you follow
- > >the guidelines for the banks of simms.... i.e. the 1 megs have to go in the
- > >correct bank.... so check the address resistor ( 470k I think... its marked)
- > >and try switching the banks of simms (in pairs) your problem should go away.
- > >
- >
- > Actually, in the SE it's not a resistor, it's a jumper. If the machine
- > formerly had 4M of RAM in it, the jumper should have been removed. It is
- > labelled as to the correct configurations.
- >
-
- Actually, since there have been multiple versions of the SE LB, you are
- both right, the jumper is out for both 2.5 mb and 4mb; the resistors are (i
- think) also both out for 2.5 and for 4mb.
-
- For either machine, for 2.5 mb, the 1mb simms must be in the slots closest
- to the cpu chip (ie, the interior slots).
-
- (thank you Larry Pina).
- --
-
- Dana S Emery <de19@umail.umd.edu>
-