NXC  Version 1.2.1 r5
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void OnFwd ( byte  outputs,
char  pwr 

Run motors forward.

Set outputs to forward direction and turn them on.

outputsDesired output ports. Can be a constant or a variable, see Output port constants. If you use a variable and want to control multiple outputs in a single call you need to use a byte array rather than a byte and store the output port values in the byte array before passing it into this function.
pwrOutput power, 0 to 100. Can be negative to reverse direction.
ex_onfwd.nxc, ex_yield.nxc, and util_rpm.nxc.