Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!cs.utexas.edu!ut-emx!mjl
From: mjl@ut-emx.UUCP (mjl)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Trouble with A3000 memory installation (problem solved!)
Message-ID: <36748@ut-emx.UUCP>
Date: 25 Aug 90 09:44:43 GMT
References: <36667@ut-emx.UUCP>
Reply-To: mjl@emx.UUCP (Maurice LeBrun)
Organization: UTexas Computation Center, Austin, Texas
Lines: 37

It works, yippee!  
Nearly infinite ram now, well for a while at least :-).

In article <36667@ut-emx.UUCP>  I wrote:
>With my collection of net.wisdom and 'Introducing the Amiga 3000' in
>hand, I boldly set out to install my new 8 1Mx4 70ns ZIP SCRAMS.  But
>all I get now when attempting to boot is the dreaded yellow screen
>(after getting to the kickstart screen).
>
>I took care to:
>- be properly grounded
>- install ZIPs in proper bank (bank 0), and correct orientation
>- move 1MB DIPS to Chip ram section
>- change jumper
>- reassemble machine

Unfortunately I did NOT:
 - make sure backplane (daughterboard) was inserted correctly (it
requires a fairly good shove)

Reinserting it corrected the problem.  An old message posted by Ross
Cunniff clued me in on this.

Regarding the jumper for switching between 1Mx4 and 256Kx4 chips, I wrote:
>I'm a little concerned about the jumper -- the manual says number J852
>and gives a picture of a jumper with 3 pins, but the one on the
>motherboard with this number has five pins.  [...deleted]

One person wrote me saying that his indeed had only 3 pins.  I assume
mine was an older motherboard revision (6.3).  Mayhaps this was
support for other memory chips?

Enough banter, time to go play with my new toy :-).

Maurice LeBrun                  Internet: mjl@fusion.ph.utexas.edu
Institute for Fusion Studies              14547%NERSC@CCC.NERSC.GOV
University of Texas at Austin     Phonet: 512-471-6149