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Memory Parity Error

Posted on 1997-03-10
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Last Modified: 2013-12-16
My system does not have EDO memory.  It worked fine with DOS and Windows 3.1 but W95 says "Memory Parity Error, System Halted".  Is there someway to fix this problem without changing or removing any SIMMs?
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Question by:Charm
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smeebud earned 100 total points
ID: 1744727
There's a lot of reasons you could get that error message.
Are you are using a memory-mapped video driver (such as with
DirectX)if so, make sure you have the latest DirectX. Or remove them temporally, and see if you still get the message.
RESOLUTION
For information about your display adapter and its video memory
capabilities, refer to your computer's documentation, or consult your hardware vendor.
Also, ram may be defective and a simm checker may not pick it up.
I just found this out with my own system. Here is MSKB (Microsoft Knowledge base)http://www.microsoft.com/kb/ Article for you to look at to check your ram:
"Parity Error Messages May Indicate Bad Memory"
Article ID: Q134503
---------------------
THIS 1st DOES NOT APPLY TO YOU:
Parity errors can also be caused by:
Mismatched RAM. That is, mixing different types of SIMMs
(such as parity and non-parity RAM) on the motherboard.
Incorrect RAM for the motherboard. For example, non-parity
RAM on a motherboard requiring parity RAM.
Non-proprietary RAM on a motherboard that required proprietary
RAM.
-----------------------------------------------------------------
                        RESOLUTION
There are two methods you can use to identify whether defective
memory chips are causing the problem:
Remove or replace memory chips in the computer to see if the
problem is resolved.
Try limiting the amount of memory that Windows 95 uses. To
do so, follow these steps:
1. Use any text editor (such as Notepad) to edit the System.ini
file.
2. Add the following line in the [386Enh] section of the file
MaxPhysPage=<nnn> where <nnn> determines the amount of memory you want Windows 95 to use.
To limit Windows 95 to the first 16 MB of memory, add the following line:
MaxPhysPage=FFF
To limit Windows 95 to the first 8 MB of memory, add the following line:
MaxPhysPage=7FF
To limit Windows 95 to the first 4 MB of memory, add the following line:
MaxPhysPage=3FF
3. Save and then close the System.ini file.
4. Restart your computer.
For more information on troubleshooting memory, please see the
following article(s) in the Microsoft Knowledge Base:
ARTICLE-ID: Q142546
TITLE: How to Use a RAM Drive to Troubleshoot Memory
                        MORE INFORMATION
Defective memory chips may not be detected by memory checking
tools. Some memory checking programs are not adequate tests
because they do not test RAM in the same way that Windows uses
RAM. Most memory checkers use read/write cycles when scanning
memory. Since Windows is executing code from memory, it uses
execute cycles. Execute cycles are different from read/write cycles and are more vulnerable to parity errors. It is possible for memory checking programs to find parity errors if the memory is extremely faulty. Bad memory chips can also cause the following situations:
Fatal Exception errors Himem.sys load failures in normal or Safe mode
Random lockups
The computer may stop responding (hang) as soon as you turn
it on
------------------------------------------------------------
If none of this works, switch your memory chips from one slot to the other.
Please give more info about your system.

bwil@erinet.com
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