Quote Originally Posted by jessey View Post
Even though the program worked good using _INTRC_OSC_NOCLKOUT I changed it to _INTRC_OSC_CLKOUT, am I right in doing that
In CLKOUT mode you can send a clock pulse signal out to another device.
NOCLKOUT you can use the pins for I/Os

and also is there a way for me to verify that the program is running on 4 MHz without using an oscilloscope?
Program a simple blinky with one LED that will blink at a certain rate. If you code has
DEFINE OSC 4
and the chip is running at 4MHz, then the LED will blink at the correct rate.