Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!ncis!helios.ee.lbl.gov!pasteur!ucbvax!XEROX.COM!Ronald_Sampson.HENR801c
From: Ronald_Sampson.HENR801c@XEROX.COM
Newsgroups: comp.sys.apple
Subject: Re: Apple II GS Memory Problems
Message-ID: <890117-091142-3457@Xerox>
Date: 17 Jan 89 16:41:39 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 22

Gene,
I have found a number of things about the Apple II GS and the memory
expansion board.  
1.	the 41256 -150 chips must have CAS before RAS during the refresh cycle.
This means the Column Address Strobe is refreshed before the Row Address
Strobe.   
2.	The NEC chips, though designed to be CAS before RAS, had a batch that
were manufactured incorrectly.  These chips were manufactured in the UK and
Japan unforturnately I don't have the information that can cull out the bad
ones made at these locations.  However your local service center should
have the information.

Finally, I am having the same problem.  I am using Samsung chips designated
KM41256AP 15, KOREA 832.  I called Apple  and they said they had approved
these chips along with the KM41257 for use in Apple products.  I called
Samsung and these chips also have the CAS before RAS function.  However the
chips still don't work in the computer.   My assumption is that Samsung has
manufactured a defective batch.  

That is the situation as it stands today.

ronald