home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.ibm.ps2.hardware
- Path: sparky!uunet!cis.ohio-state.edu!magnus.acs.ohio-state.edu!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!ux1.cso.uiuc.edu!news.iastate.edu!isucard.card.iastate.edu!MLONG
- From: MLONG@isucard.card.iastate.edu
- Subject: Re: How to upgrade PS/2 model 90 from 8 to 16Mb?
- Message-ID: <16841D98E.MLONG@isucard.card.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Organization: CARD
- References: <16a5gbINNk49@agate.berkeley.edu>
- Date: Wed, 12 Aug 1992 21:28:10 GMT
- Lines: 32
-
- In article <16a5gbINNk49@agate.berkeley.edu>
- stanton@haas.berkeley.edu (Richard Stanton) writes:
-
- >Not having done this before, do I just buy and plug in some extra memory
- >chips (in which case, what speed and format for a 25MHz model 90), or
- >do I have to rip out and throw away the old memory and replace it with
- >denser chips?
- >
- >Also, what upgrades are possible (i.e. can I just increase to 9Mb, 10Mb or what
- >I like, or are there restrictions on the total amount of memory?
- >
- >Thanks a lot
- >
- >Richard Stanton
- >
- The 90 has 8 72 pin sockets for 36 bit SIMMs. If you have the 25MHZ 486SX (fam
- ily 2) you can use 70ns or 80ns memory, of 1,2,4,8MB in size. With the family
- 2 you are also supposed to be able to not have to install SIMM's in matched pai
- rs. Family 1 25MHZ, 486DX you will have to install in matched pairs, put it
- also supports 85ns as well as 70,80.
- You probably have either 2 4MB SIMMS or 4 2MB SIMMS. Just add 2 more 4MB SIMMS
- to bring your system up to 16MB. System max is 64MB (8 8MB SIMM). If you have
- 2 4MB SIMMS just use the 2 new SIMMS you purchased to fill up the 1st memory
- riser card. If you have 4 2MB SIMMS, place the two new SIMMS on the second (em
- pty) memory riser card in the bottom and 3rd form the bottom sockets.
- I highly recomend getting the 70ns SIMMs. If you have trouble with parity or
- memory errors after installing the memory, repost and I will dig up the info
- about reordering SIMMS on the memory riser cards according to whether they are
- high load or low load.
- Good luck
- Mike Long
- Iowa State University
-