I get the feeling we're talking about two different things here:
I'm not looking to trim or calibrate the internal oscillator for communications or anything precise. The PIC 16F737 has several internal oscillator frequencies. Mine appears to be running at the 35kHz instead of 4MHz. I have no idea of how to change it.
Let me clarify the project. I'm building quite a few of these sequencers... Dozens. I want to use the internal oscillator to keep parts & cost to a minimum.
These are really simple. One digital input, 16 outputs... nothing more. no communications. I have my existing firing panels which will trigger the input high via an optocoupler. The outputs with then go high at the intervals defined by the delay variable. That's it.
I really have no need to go any deeper with PicBasic or with PICs than this as these boards are my end goal. Once they are working, I'm done. I just need the outputs to sequence faster than they are now.
Hope this helps.