ROM and RAM Error Codes Explained

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Article ID: 76922 - View products that this article applies to.
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SUMMARY

In the event that a RAM or ROM chip fails, a multidigit error code will be displayed. The error code is displayed only briefly, then replaced by the message
PARITY CHECK x
where if x=1, the problem is on the system board or is power supply problem, and if x=2, the problem is on one of the memory expansion adapters.

The multidigit error codes can be used to determine where the chip error occurred.

MORE INFORMATION

ROM Error Codes

During power-on-self-test (POST), a failed ROM chip will display an error code in the following format
   xx00 ROM
				
-or-
   xx000 ROM
				
where xx is the hexadecimal address of the failed ROM.

Not all problems can be identified by an error code, because some problems will prevent the computer from booting at all.

The following table shows some of the possible error codes and what they mean:
Error Code    Computer     Location of Faulty ROM
----------    --------     ----------------------

C800 ROM       All         Hard disk drive adapter
CC00 ROM       PC,XT       PC network
IO ROM CC00    XT 286,AT   PC network
F600 ROM       PC          U29
F800 ROM       PC          U30
FA00 ROM       PC          U31
FC00 ROM       PC          U32
Fxxx ROM       PC          System board
ROM Error      all         System board
IO ROM xxxxxx  XT 286, AT  Power related
				

RAM Error Codes

When the last three numbers of an error code are 201, it indicates an error in the RAM area. The numbers preceding 201 are the code that identifies the specific chip. Error code formats appear as follows:
Computer          Error Code Format
--------   -----------------
PC                xxx 201
XT                xxxxx xx 201
AT and PS/2       xxxxxx xxxx 201
				
Note: x represents hexadecimal characters.

The first one or two characters indicate the bank or expansion adapter, and the two to four characters preceding 201 represent the specific chip that failed.

If a chip has failed in one of the first few memory banks, the error code may disappear very quickly. Ensure that the display is warmed-up sufficiently to show the error code.

For more information, query on the following words:
parity error and meaning and message

parity check and error and description

REFERENCES

"The PC Configuration Handbook," John Woram, pages 259-275, Bantam, 1990

"IBM PC Troubleshooting and Repair Guide," Robert C. Brenner, H.W. Sams & Co., 1985

Properties

Article ID: 76922 - Last Review: November 21, 1999 - Revision: 1.0
APPLIES TO
  • Microsoft MS-DOS 5.0 Standard Edition
Keywords: 
KB76922
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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