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_8087 Each time a program begins execution, a determination is made as to whether an 8087 or 80287 co-processor is present. If present, all floating point calculations are performed using it. If not present, all floating point calculations are performed by software emulation. The _8087 global variable defined in c.asm, can be tested to see if an 8087/80287 is present. If the _8087 variable is equal to 0, there is no 8087 present. A value of 1 indicates that either an 8087 or an 80287 has been found. A value of 3 means that an 80387 is present.