[comp.sys.mac] Mac SE SIMM question

steve@hp-ptp.HP.COM (Steve_Witten) (08/10/89)

What size SIMM's do SE's use to make up their standard 1 Mb -- 4 SIMMs @
256 Kb each or 1 SIMM @ 1 Mb each?

Thanks.

===============================================================================
Steve Witten                    steve%hp-ptp@hplabs.HP.COM
Industrial Applications Center  {ucbvax, hplabs}!hpda!hp-ptp!steve
Hewlett-Packard Co.             steve@hp-ptp

"...I'm no fool! Nosirree!..." -- J. Cricket

ajq@mace.cc.purdue.edu (John O'Malley) (08/11/89)

In article <1570010@hp-ptp.HP.COM> steve@hp-ptp.HP.COM (Steve_Witten) writes:
>What size SIMM's do SE's use to make up their standard 1 Mb -- 4 SIMMs @
>256 Kb each or 1 SIMM @ 1 Mb each?
>
>Steve Witten                    steve%hp-ptp@hplabs.HP.COM

SIMMs don't work unless installed in even numbers, if I understand things
correctly.  One 1 meg SIMM would not work alone.  The Mac SE (or any Mac
that ships with just 1 meg RAM) has four 256K SIMMs.

Please, someone correct me if I'm wrong ...


John O'Malley           / Macintosh  / Purdue University / (317)
mace.cc.purdue.edu!ajq / Specialist / Computing Center  / 494-1787

cjp@Apple.COM (Chris Plummer) (08/11/89)

In article <2874@mace.cc.purdue.edu> ajq@mace.cc.purdue.edu (John O'Malley) writes:
>In article <1570010@hp-ptp.HP.COM> steve@hp-ptp.HP.COM (Steve_Witten) writes:
>>What size SIMM's do SE's use to make up their standard 1 Mb -- 4 SIMMs @
>>256 Kb each or 1 SIMM @ 1 Mb each?
>>
>>Steve Witten                    steve%hp-ptp@hplabs.HP.COM
>
>SIMMs don't work unless installed in even numbers, if I understand things
>correctly.  One 1 meg SIMM would not work alone.  The Mac SE (or any Mac
>that ships with just 1 meg RAM) has four 256K SIMMs.
>
>Please, someone correct me if I'm wrong ...
>
>
>John O'Malley           / Macintosh  / Purdue University / (317)
>mace.cc.purdue.edu!ajq / Specialist / Computing Center  / 494-1787

The SE and the Plus have 4 SIMM slots and require SIMMs to be installed
in pairs.  The SE/30, Mac II, Mac IIx, and Mac IIcx have 8 SIMM slots
and require the SIMMS to be installed in groups of 4.
  
Chris Plummer                                              AppleLink: PLUMMER1
Communications Product Development                     internet: cjp@Apple.com
Apple Computer, Inc.              UUCP:  {amdahl,decwrl,sun,unisoft}!apple!cjp

bklaas@cmdfs2.intel.com (Brian Klaas~) (08/11/89)

In article <2874@mace.cc.purdue.edu> ajq@mace.cc.purdue.edu (John O'Malley) writes:
>In article <1570010@hp-ptp.HP.COM> steve@hp-ptp.HP.COM (Steve_Witten) writes:

>SIMMs don't work unless installed in even numbers, if I understand things
>correctly.  One 1 meg SIMM would not work alone.  The Mac SE (or any Mac
>that ships with just 1 meg RAM) has four 256K SIMMs.
>
>Please, someone correct me if I'm wrong ...

This is true of the SE, but not of the II family.  The mac II has
eight SIMM slots, two banks of four.  Each bank must either be empty,
or full of identical sized SIMMS.