https://wikiti.brandonw.net/index.php?action=history&feed=atom&title=83Plus%3ABCALLs%3A409083Plus:BCALLs:4090 - Revision history2026-04-05T17:37:50ZRevision history for this page on the wikiMediaWiki 1.23.5https://wikiti.brandonw.net/index.php?title=83Plus:BCALLs:4090&diff=3637&oldid=prev66.66.23.91 at 04:29, 25 April 20052005-04-25T04:29:24Z<p></p>
<p><b>New page</b></p><div>[[Category:83Plus:BCALLs:By Name:FP_Util|InvOP2S]] [[Category:83Plus:BCALLs:By Name|InvOP2S]] [[Category:83Plus:BCALLs:By Address|4090 - InvOP2S]]<br />
== Synopsis ==<br />
'''Official Name:''' InvOP2S<br />
<br />
'''BCALL Address:''' 4090<br />
<br />
Negates the floating point number in [[83Plus:RAM:8483|OP2]].<br />
<br />
=== Inputs ===<br />
* OP2 = floating point number <br />
<br />
=== Outputs ===<br />
* OP2 = -OP2<br />
<br />
=== Registers Destroyed ===<br />
* AF<br />
<br />
=== Comments ===<br />
This routine inverts the sign bit of OP2 unless it is a floating point zero. If the value in OP2 is a floating point zero, then the sign bit is not inverted.<br />
<br />
== Example ==<br />
<nowiki>B_CALL OP2Set3 ;OP2=floating point 3<br />
B_CALL InvOP2S ;returns with OP2=-3<br />
</nowiki></div>66.66.23.91