I have a IIx and it doesn't go beyond 4MB SIMMs unless they're PAL-SIMMs
(there's problems w/ the memory control circuitry on the main board of a II
or IIx (same board), so they require a ninth chip on the SIMMs - the PAL
chip to fix this problem.) Also, I know the order that you put your SIMMs in
makes a difference. The IIx has two banks w/ 4 slots each. I know that if
you have one bank with small size SIMMs, say one bank of 4MB and one bank of
1MB, the bank that they're in seems to matter - I can't remember which bank
requires the smaller SIMMs, but I think I found that info on the web. I know
all this info is for the IIx, but it may relate to the IIcx (similar
boards). Ed
----- Original Message -----
From: John Valdes <j-valdes@uchicago.edu>
To: Tod McQuillin <devin@spamcop.net>
Cc: <port-mac68k@netbsd.org>
Sent: Tuesday, May 30, 2000 10:43 PM
Subject: Re: IIcx SIMM configuration


> > For those of you with Mac IIcx's, what memory configurations are you
> > using?  Has anyone successfully used 16MB SIMMS in a IIcx?  How about
4MB
> > SIMMS?
>
> I haven't used 16MB SIMMs, but I've used 4MB SIMMs w/o problems in my
> IIcx.
>
> > When the 16MB SIMMS are installed in bank A, the IIcx plays the "death
> > chimes" and refuses to start up (regardless of what is in bank B).
> >
> > When 1MB SIMMS are in bank A and 16MB SIMMS are in bank B, the system
> > boots but only sees 8MB of RAM (I am running MODE32 and 32-bit
addressing
> > is enabled).
>
> Configs I've used successfully include 1MB SIMMs in bank A w/ 4MB
> SIMMs in bank B (so 20MB total), and 4MB SIMMs in both A & B (32MB
> total).
>
> I always thought 16MB SIMMs didn't work in the IIcx (while they do in
> the IIci, as do the odd sized SIMMs, 2MB, 8MB, etc); however, one day
> 16MB SIMMs magically appeared as supported on the IIcx according to
> AppleSpec...  I notice that the IIx doesn't list support for 16MB
> SIMMs on AppleSpec, FWTW (the IIx & IIcx are more similar to each
> other than the IIcx and IIci).
>
> > Any ideas?
>
> There's always the possibility that the SIMMs are DOA.  Do you have
> another system known to support 16MB SIMMs in which you could test
> them?
>
> > (Of course this is for the purpose of running NetBSD; I am
> > asking here rather than on a general Mac users list because I figure
> > NetBSD users have more incentive to upgrade past 8MB to build kernels).
>
> Actually, my primary incentive was Netscape 4 under MacOS, but going
> past 8MB in NetBSD certainly helps a lot too. :)
>
> John