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Space Exploration

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  • $\begingroup$ Could you explain what is done in line 214? The case arctan = 0 for x = 0 and y = 0? $\endgroup$ Commented Oct 11, 2018 at 11:52
  • $\begingroup$ @uwe BZE is branch when zero, if true it will run ARCTANXX (after that I am lost). Not sure what RVQ does, return value quit maybe? $\endgroup$ Commented Oct 11, 2018 at 13:14
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    $\begingroup$ @MagicOctopusUrn: RVQ is Return via QPRET. Returns to the location specified in the QPRET register. This is the normal way to return from a subroutine, although if the QPRET register had previously been saved to a memory location, then GOTO can be used instead. BZE seems to use the previously computed value gamma = sqrt(x^2+y^2) to find out if both x and y are zero. $\endgroup$ Commented Oct 11, 2018 at 15:44
  • $\begingroup$ @DrSheldon Do you want to take a stab at space.stackexchange.com/q/31196/195 ? $\endgroup$ Commented Oct 11, 2018 at 16:06
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    $\begingroup$ @RussellBorogove: I've been working on it and hope to have an answer later today! $\endgroup$ Commented Oct 11, 2018 at 16:27