new A500 and 1.5 MB memory

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#2299

From: Olivier BORDES
Date: Tue, 21 Nov 1989 16:29

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From a friend who cannot access Notes:
-------------------------------------

On the new AMIGA 500, it is possible to install 512K of additional
memory on the main board. By keeping the extension card A501 the total
amount of memory should be 1.5 Mb. Unfortunately after having installed
the 4 additional chips on the main board my Amiga continue to see only
1 Mb (with the A501 card).
  Do you know if something special has to be done (hardware configuration
change, software to install...) ?

For your information the Gary chip is a 8372 (new version) and the PC
boards layout is different of the hardware schematics shipped with the
product.
By default the extended memory is mapped in C00 000. If you change J2
position to map it in 019 000 then the 1Mb on board are seen but if
you plug the A501 board there is no change.

Any information is welcome, thanks in advance for your help.
Best regards
Jacques D


(you may reply or send answers directly to me , I will formward them.
My mail address is  olivier@hpgnd.hp.com).

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!swrinde!ucsd!ucbvax!hplabs!hp-ses!hpbbn!hpgnd!olivier
From: olivier@hpgnd.HP.COM (Olivier BORDES)
Newsgroups: comp.sys.amiga.tech
Subject: new A500 and 1.5 MB memory
Message-ID: <4260001@hpgnd.HP.COM>
Date: 21 Nov 89 16:29:06 GMT
Organization: Hewlett-Packard, GND
Lines: 25