Cray CRAY-1 - Page 170

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3. If more than one syndrome bit is 1 and the parity of
all syndrome bits SO through S7 is even, then a double
error occurred within the data bits or check bits.
4. If more than one syndrome bit is 1 and the parity of all
syndrome bits is odd, then a single and correctable error
is assumed to have occurred. The syndrome bits can be
decoded to identify the bit in error.
5. Results are ambiguous for three or more bits in error.
2240004
5-8
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