Article ID: 76922 - View products that this article applies to.
This article was previously published under Q76922
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
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.
PARITY CHECK x
The multidigit error codes can be used to determine where the chip error occurred.
ROM Error CodesDuring power-on-self-test (POST), a failed ROM chip will display an error code in the following format
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 CodesWhen 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:
Note: x represents hexadecimal characters.
Computer Error Code Format -------- ----------------- PC xxx 201 XT xxxxx xx 201 AT and PS/2 xxxxxx xxxx 201
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
"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
Article ID: 76922 - Last Review: November 21, 1999 - Revision: 1.0