Routines |
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This subroutine prepares a floating-point number for multiplication or division, returning with carry set if the number is zero, getting the sign of the result into the A register, and replacing the sign bit in the number by the true numeric bit, 1.
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PREP_M_D | 30C0 | CALL TEST_ZERO | If the number is zero, return with the carry flag set. | |||||||||||||
30C3 | RET C | |||||||||||||||
30C4 | INC HL | Point to the sign byte. | ||||||||||||||
30C5 | XOR (HL) | Get sign for result into A (like signs give plus, unlike give minus); also reset the carry flag. | ||||||||||||||
30C6 | SET 7,(HL) | Set the true numeric bit. | ||||||||||||||
30C8 | DEC HL | Point to the exponent again. | ||||||||||||||
30C9 | RET | Return with carry flag reset. |
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