83Plus:BCALLs:40C0

Synopsis

Official Name: cos

BCALL Address: 40C0

Computes the cosine of OP1 and returns the result in OP1.

Inputs

• OP1 = floating point

Outputs

• OP1 = cosine of OP1
• Approx. TStates: 150,000 to 200,000

Destroys

• AF, BC, DE, HL
• OP1-OP5

Comments

The cycle count for this routine is very high because the algorithm uses an infinite series to approximate the cosine. Where speed is critical, a trig table should be used.

Example

B_CALL OP1Set3  ;OP1=floating point 3
B_CALL cos  ;returns with OP1=-0.9899924...