IBM PS/2 90 XP 486 Hardware Maintenance Reference page 25

2.4.3 Types of Error Detection
The systems use either parity or Error Correction Code (ECC) to detect
memory errors (but not a combination of both).
Memory that uses parity can detect (but not correct) memory errors.
If an error occurs during POST, an error code is displayed.
error occurs after POST, the system halts.
Memory that uses ECC can detect and correct memory errors.
error occurs during or after POST, the error is corrected without
interfering with the system operation.
capability will result in fewer memory-related service calls.
IBM PS/2 Model 90 XP 486 and 95 XP 486 HMR
Types of Error Detection
This error-correcting
¦ Copyright IBM Corp. 1990, 1992
2.4.3 - 1
If an
If an