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Conference noted::ibmpc-95

Title:IBM PCs, clones, DOS, etc.
Notice:Intro in 1-11, Windows stuff in NOTED::MSWINDOWS please
Moderator:TARKIN::LINND
Created:Tue Jan 03 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3023
Total number of notes:28404

2887.0. "memory simm true vs. logic" by STAR::VAN_ERON () Wed Jan 22 1997 16:34

T.RTitleUserPersonal
Name
DateLines
2887.1LGP30::FLEISCHERwithout vision the people perish (DTN 381-0426 ZKO1-1)Wed Jan 22 1997 17:3114
2887.2WRKSYS::INGRAHAMAndyThu Jan 23 1997 01:146
2887.3simms/paritySTAR::VAN_ERONThu Jan 23 1997 12:0116
2887.4skylab.zko.dec.com::FISHERGravity: Not just a good idea. It's the law!Thu Jan 23 1997 15:284
2887.536-bit hardware parity.JULIET::HARRIS_MANetworks Sales ExecThu Jan 23 1997 16:179
2887.6WRKSYS::INGRAHAMAndySat Jan 25 1997 19:225
Keep in mind that fake parity memory needs a chip to generate the fake
parity.  Also, DIMMs (maybe some SIMMs too?) have a buffer IC for some of
the control lines.

So you should check the numbers on the chips too, not just their quantity.
2887.7BADA BINGSTAR::VAN_ERONWed Jan 29 1997 13:1419
    Hopefully this information might help someone else. 
    
    I ended up buying the 16MB/60/true parity simm. After installing
    it the system should have seen 24MB but only saw 16MB.
    I experimented with various combinations but could never
    get my original (2)2X16 to work with the (1)4X16. Each would work
    ok by themselves .. in other words the system would come
    up on 16MB or 8MB.
    
    I spoke with the company I bought from who had assured me
    that it work. To make a long story short I did not
    like any of the options they gave me to resolve the problem.
    
    Last nite after more frustration of getting this to work
    I found the problem. My system is a GW with a PHOENIX BIOS.
    I had to set BIOS/VIDEO SHADOW = DISABLED for the system
    to recognize above 16MB memory. How do you spell relief!!
    
    Dennis 
2887.8thats betterSTAR::VAN_ERONWed Jan 29 1997 16:0212
    
    Just a bit of clarification. What it should have said in 
    -1 was
    
    I experimented with various combinations but could never
    get my original (2)1X36 to work with the (1)4X36. 
    
    Sorry for any confusion
    
    Arent PC's wonderful..
    Dennis