NXC  Version 1.2.1 r5
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void OnRevRegEx ( byte  outputs,
char  pwr,
byte  regmode,
const byte  reset 

Run motors backward regulated and reset counters.

Run the specified outputs in reverse using the specified regulation mode.

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.
regmodeRegulation mode, see Output port regulation mode constants.
resetPosition counters reset control. It must be a constant, see Tachometer counter reset flags.