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>> This routine will throw an ErrDomain when OP1 is negative.

Even if a+bi or re^thetai mode is on?

Seeing as this is an official equate, I'd guess that it is indeed the equate for SqRoot and not CSqRoot. With that said, adapting this routine simply to work with negative numbers (as opposed to actually implementing CSqRoot) is trivial. FloppusMaximus 20:21, 15 Apr 2005 (PDT)
Yes, the first instruction in this routine is "call _ERRD_OP1NOTPOS". As for CSqRoot, none of the complex versions of the FP routines are officially equated for the 83, but sure they must exist. --Kalimero 03:31, 16 Apr 2005 (PDT)