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From: ss@sprite.Berkeley.EDU (Srinivasan Seshan)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: IBM PS/2 Model 55SX
Message-ID: <1990Dec6.040401.10290@agate.berkeley.edu>
Date: 6 Dec 90 04:04:01 GMT
References: <16302@brahms.udel.edu> <1104@pyuxe.UUCP> <6272@mace.cc.purdue.edu> <1990Dec5.231442.23445@sbcs.sunysb.edu>
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Reply-To: ss@sprite.Berkeley.EDU (Srinivasan Seshan)
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In article <1990Dec5.231442.23445@sbcs.sunysb.edu>, altman@sbstaff2.cs.sunysb.edu (Jeff Altman) writes:
|> Then wanted more memory.  there are two memory slots on the 
|> motherboard which can take either 1mb or 2mb chips.  The system
|> I had came with 2 - 1mb SIMMS.  So as opposed to buying 2 - 2mb 
|> SIMMS and saving the 1mb SIMMs for a rainy day (expensive) I installed
|> an additional memory card with 2mb of memory (cheaper).  (2 slots)
|>


....some other stuff....



|> 
|> Possible solutions are taking out the memory board and buying the 2mb
|> SIMMs but that limits me to a total of 4mb of memory.  Or buying 
|> another hard disk and get rid of the current internal drive and the 
|> external drive.  But this prevents me from installing a SCSI tape
|> backup unit and a CD-ROM off of the SCSI.  So the dilemma is there
|> 
|> Time to buy a new machine.
|> 
|> - Jeff (jaltman@ccmail.sunysb.edu)


Two things -

1)  I would go talk to the dealer that you purchased you 55SX from  since 
	you got robbed!!  The 55SX-061 (60meg hard drive model) has always
	come with 1-2meg simm.  The 55SX-031 (30meg hard drive) initially
	came with 2-1meg simms but was changed (I think last summer) to
	also have 1-2meg simm.  I remember seeing some news of various
	IBM dealers replacing the simms in the 55SX (since they were 80ns 
            ^^^^^^^ (not IBM)
	simms but the 55SX need only 100ns?) with cheaper simms.  Something
	similar might have happened with you.

2)  The 55SX will take 4meg simms on the motherboard for a total possible
	of 8megs on the motherboard (two - 4meg simms).  I currently have
	6megs (a 4meg and a 2meg) in my 55SX-061.  

General comments -  I am quite satisfied with my 55SX.  The only problem I've
ever had is that when I bought a 5.25" floppy for it they were quite expensive
and slow (~$300)  It seems that they are cheaper now ~180 (pacific rim at soft
warehouse).  

Also one comment about the 4meg simms.  Putting one in your 55SX slows down
performance by about 10-15% on various benchmarks.  Are memory accesses slower
for some reason????  Does anyone know anything about this??? 



Srini Seshan