The FIX166 directive is required to resolve problem A17 of the 80C166 CA step (typically the bond-out version of the 80C166) or the GOLD chip based on this chip version. When the FIX166 directive is used, the following instructions are inserted before each RETI instruction:
BFLDH PSW, #0F0h, #0F0h
NOP
NOP
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