ANE (0x8b) is an unstable illegal opcode that depends on a "constant" value that isn't
really constant. It varies between machines, with temperature, and so on. Original sim65
behavior was to use the constant value 0xEF. To get the behavior in line with the 65x02
testsuite, we now use the value 0xEE instead, which is also a reasonable choice that can
be observed in practice.
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