Difference between revisions of "83Plus:BCALLs:408D"
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'''BCALL Address:''' 408D | '''BCALL Address:''' 408D | ||
| − | Negates the floating point number in [[83Plus:RAM: | + | Negates the floating point number in [[83Plus:RAM:8478|OP1]]. |
=== Inputs === | === Inputs === | ||
| Line 21: | Line 21: | ||
== Example == | == Example == | ||
<nowiki>B_CALL OP1Set3 ;OP1=floating point 3 | <nowiki>B_CALL OP1Set3 ;OP1=floating point 3 | ||
| − | B_CALL InvOP1S ;returns with OP1=-3 | + | B_CALL InvOP1S ;returns with OP1=-3</nowiki> |
| − | </nowiki> | + | |
Latest revision as of 07:26, 26 April 2005
Synopsis
Official Name: InvOP1S
BCALL Address: 408D
Negates the floating point number in OP1.
Inputs
- OP1 = floating point number
Outputs
- OP1 = -OP1
Registers Destroyed
- AF
Comments
This routine inverts the sign bit of OP1 unless it is a floating point zero. If the value in OP1 is a floating point zero, then the sign bit is not inverted.
Example
B_CALL OP1Set3 ;OP1=floating point 3 B_CALL InvOP1S ;returns with OP1=-3
