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From: colas@lemur.inria.fr (Colas Nahaboo)
Newsgroups: comp.sys.amiga.hardware
Subject: Using A501 as chip RAM on A500 for Rev6a motherboards
Message-ID: <10457@mirsa.inria.fr>
Date: 15 Mar 91 10:27:06 GMT
Sender: news@mirsa.inria.fr
Organization: Koala Project, Bull Research France
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Well, if you have at least a Rev. 6a (or later I presume) motherboard, on your
A500 it is even simpler than the explanations I previously posted: 

- find jumper JP2 (up-left of 68000) up and middle plots are connected, you  
  must cut this and connect middle to low.

- find jumper JP7A (near A501 connector), and totally open it. (up and middle 
  were connected)

that's it!! no trace to cut, easily reversible...
This will work with any 512K trapdoor ram expansion to the 500.
My 500 has now 1 Mega of chip ram, and works perfectly...

-- 
Colas Nahaboo, colas@sa.inria.fr, Bull Research, Koala Project, GWM X11 WM
Phone:(33) 93.65.77.70(.66 Fax), INRIA, B.P.109 - 06561 Valbonne Cedex, FRANCE.