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Routines |
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The address of this routine is found in the table of addresses. It is called via the calculator literal +28 by the routines at CD_PRMS1 and asn. It is also called indirectly via fp_calc_2.
This subroutine handles the function SQR X and returns the positive square root of the real number X if X is positive, and zero if X is zero. A negative value of X gives rise to report A - invalid argument (via to_power).
This subroutine treats the square root operation as being X**0.5 and therefore stacks the value 0.5 and proceeds directly into to_power.
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sqr | 384A | RST $28 | X | |||||
384B | DEFB $31 | duplicate: X, X | ||||||
384C | DEFB $30 | f_not: X, (1/0) | ||||||
384D | DEFB $00 | jump_true to LAST: X | ||||||
384E | DEFB $1E | |||||||
The jump is made if X=0; otherwise continue with:
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384F | DEFB $A2 | stk_half: X, 0.5 | ||||||
3850 | DEFB $38 | end_calc | ||||||
Continue into to_power to find the result of X**0.5.
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