Chapter 3.3 MEMORY ERROR CODES
Memory error codes appear when the system detects a memory fault during the
Power On Self Test (201 or 203 error codes) or as a result of a diagnostic
test. The TEST programs attempt to isolate the memory fault to a specific
location, then generate a memory error code.
The memory error code points to a specific memory address. The physical
location of the memory address depends on the number and type of memory boards
installed and the type of memory device used.
Memory error codes are displayed in an eight digit format (XX000Y ZZ). The XX
and Y alphanumeric codes are like key identification points for defective
memory isolation.
XX000Y ZZ Error Message
| | | | |-------- 201 (ROM)
||||
| | | --------------------- Failed data bit. Values are: 00, 01, 02, 04,
| | | 08, 10, 20, 40, 80, ??
|||
| | | 00 = parity bit
| | | 01 = data bit 0
| | | 02 = data bit 1
| | | 04 = data bit 2
| | | 08 = data bit 3
| | | 10 = data bit 4
| | | 20 = data bit 5
| | | 40 = data bit 6
| | | 80 = data bit 7
| | | ?? = unable to determine failed data bit.
|||
| | ------------------------ Failed byte. Values are 0, 1.
||
| -------------------------- Always 000.
|
----------------------------- Failed address. Values are 00 through FF.
0X = error in 1st megabyte
1X = error in 2nd megabyte
2X = error in 3rd megabyte
3X = error in 4th megabyte
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