Hi Larry,
To access the individual bytes in an array you do:
Code:
Position VAR BYTE [3]
For i = 0 to 2
   SERIN PORTA.1, 84, [POSITION[i]]
   SEROUT PORTA.0, 84, [POSITION[i]]  
Next
Note that the array is zero-indexed, first byte is Position[0], last byte is Position[2].

The Position.0[i] thing you have in your notes is used when you want to access the individual bits in something not specifically declared as an array an of bits. For example Position.0[8] will access the least significant bit Position[1].

Hope that makes sense.
/Henrik.