Help using 74LS165 & 74LS164 chips with my 16F84A

[studysession]

I bought PIC Microcontroller Project Book for PICBasic and PICBasic Pro.
Attached is my schematic drawing of what I am working on. The code and schematic come right out of the book on pages 173 fig 12-10 and Source is off page 175 program 12.6.

Everything works perfect for turning on and off LED's. I have no idea what else I can do with this program. I see a lot of uses I would like to do but and unsure how to apply them.

Example -
On one of the input pins on the 74LS165 have a variable POT and read it's value. Then have a servo move according to how far the POT has moved on an output pin on the 74LS164.

That is something I would like to make happen, but and unsure what would need to be changed in the code to make that happen.

Any help would be appreciated. Thanks



CODE:

include "MODEDEFS.BAS"

B0 var byte
'initialize ports
TRISB = 4               'set port B pin 2 = input/rest output
low portb.5             'set CLK low
high portb.4            'set CLK inhibit high
high portb.3            'bring shift/load high

start:
gosub serial_in         'Get number from 74LS165
serout portb.7, t9600, [$fe,1," ____ ", #B0]
pause 1000
gosub serial_out        'send it out on 74LS164
serout portb.7, t9600, [$fe,1," ____ ", #B0]
pause 1000              'wait and see what happens
goto start              'do it again


serial_in:
pulsout portb.3,1       'bring shift/load down momentarily
low portb.4             'bring clk inhibit low
B0.7 = portb.2          'load bit into B0
pulsout portb.5,1       'bring clk pin high, then low
B0.6 = portb.2          'same as above
pulsout portb.5,1
B0.5 = portb.2
pulsout portb.5,1
B0.4 = portb.2
pulsout portb.5,1
B0.3 = portb.2
pulsout portb.5,1
B0.2 = portb.2
pulsout portb.5,1
B0.1 = portb.2
pulsout portb.5,1
B0.0 = portb.2
high portb.4            'bring clk inhibit high
return

serial_out:
portb.0 = B0.7
pulsout portb.1,1
portb.0 = B0.6
pulsout portb.1,1
portb.0 = B0.5
pulsout portb.1,1
portb.0 = B0.4
pulsout portb.1,1
portb.0 = B0.3
pulsout portb.1,1
portb.0 = B0.2
pulsout portb.1,1
portb.0 = B0.1
pulsout portb.1,1
portb.0 = B0.0
pulsout portb.1,1  
portb.1 = 0
return