Compaq 486 Maintenance And Service Manual page 43

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| | ------------------------ Failed byte.
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| -------------------------- Always 000.
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----------------------------- Failed address.
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.
Values are 0, 1.
Values are 00 through 20.
0X = error in 1st megabyte
1X = error in 2nd megabyte
2X = error in 3rd megabyte
3X = error in 4th megabyte