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From: barrey@ka.excelan.com (Barrey Jewall)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.system
Subject: Re: mac se memory upgrade
Keywords: 4meg, whats the trick?
Message-ID: <1498@excelan.COM>
Date: 3 Jul 90 18:04:14 GMT
References: <3479@chomsky.oakhill.UUCP>
Sender: news@excelan.COM
Reply-To: barrey@ka.excelan.com (Barrey Jewall)
Followup-To: comp.sys.mac.hardware
Organization: Excelan, Inc., San Jose, Califonia
Lines: 49

In article <3479@chomsky.oakhill.UUCP> pete@oakhill.UUCP (Pete Percosan) writes:
>Hello -
>
>   I have a question concerning the process for upgrading a new
>   mac se (with 20meg hd). I looked at the motherboard and located
>   the simms (not to tough) and a jumper for 1 or 2/4 meg (does this
>   mean that you can only install 4 256x8 - 1 meg, 4 512x8 - 2 meg,
>   or 4 1024x8 - 4 meg simms?). when i installed the 4 1024x8s and set
>   the jumper to the 2/4 meg setting, i found that the system only
>   thought that there was a single meg installed.

>   any pointers would be appreciated.

>   pete percosan
In the new "Jumper-Style" SE's , you need to have the jumper REMOVED for either
2.5 or 4MB. (2.5 is accomplished by using 2- 256K SIMMs in the REARMOST sockets,
and 2 1MB SIMMs in the sockets closest to the edge of the board.

This order is reversed for the "JUMPERLESS" style of motherboard (older)..

I usually take the jumper off, then stick it back on over only ONE PIN of the
set, that way I can downgrade the mac later if I must...



>p.s. assuming the correct memory speeds, will memory used for the mac II work
>     in the se? and vice versa.

Assuming that the speeds are as follows, it should work just fine...

RAM SPEEDS FOR MACINTOSH

Mac Plus, SE	-150ns
Mac II		-120ns
MAc IIx, IIcx	-100ns
Mac IIci,SE/30	-80ns (Fast Page Mode)

Good luck!

MY OPINIONS ARE MY OWN!

+================================================================+
+      San Francisco Giants - 10 Games Back and Gaining !!       +
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+===============================++===============================+
+ Barrey Jewall                 ++ "My opinions are my opinions" +
+ barrey@novell.com	        ++ (rather self-evident, eh?)    +
+ Novell, Inc.- San Jose, Calif.++				 +
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