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ASSEMBLER DIRECTIVES->Assembly Options->68881

This is the default option when the 68020 option is selected.  This enables the instructions for the 68881/2 maths co-processors.  You can use this option to enable maths co-processor instructions for 68000, 68010 and CPU32 chip.  Note however that these chips do not directly support maths co-processors.  You must therefore configure your target system yourself  to provide such support.