Main logic snippet:
Code:
...
mainloop:
    TRISA = %11111100
    PORTA = %00000001

    PORTA = %00000010
    goto mainloop
End
ASM listing:
Code:
...
	LABEL?L	_mainloop	
	MOVE?CB	0FCh, TRISA
	MOVE?CB	001h, PORTA
	MOVE?CB	002h, PORTA
	GOTO?L	_mainloop
	END?	

	END
Saleae sampling:
Name: Saleae Charlie-plex 2 pins.PNG Views: 795 Size: 43.0 KB

1 uSec per instruction at 8MHz on a 18F44K22.

Is it that simple? Or is there more going on and I'm not getting it?

(1978-1984 is so far away. Yeah, I didn't have sec 5 math so I had to take it before starting 3-yr data processing program. Of course I dropped out sec 5 math on first try; culture shock coming from high school where teachers kicked me in the butt to get things done and had to come back the next September to get it done.)

Robert