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Encoded condition code bits. Program Counter Bits 11 - 0
indicate the P.C. at the time the I/O-Error Handler was entered.
Because of the instruction pipelining in the SSP, this P.C. may point to
the instruction that would have been executed had an error not been
encountered, or 1 past it. The NPA bit is used to determine whether to
subtract one or not.
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