CPS 104	(Ramm)						Fall 1995

Example Illustrating Assembler, Loader Interaction for Simple Machine

			ASSEMBLER OUTPUT	LOADER OUTPUT
ASSEMBLER INPUT		LOADER INPUT
----------------        -------------------     ----------------

Main program		Entry point table	(assume load @500)
			   B=22R
			   X=21R
			   MAIN=11R		    *511*
     ENTRY  X,B		External ref. table
     EXTRN  DSUB	   DSUB		17
     ORG    11
GO   LOAD   X		11 LOAD		21R	511 LOAD	521
     STORE  B		12 STORE	22R	512 STORE	522
LLL  ADDI   37		13 ADDI		37	513 ADDI	37
     STORE  B+1		14 STORE	23R	514 STORE	523
     STORE  B+2		15 STORE	24R	515 STORE	524
     LOAD   Y		16 LOAD		25R	516 LOAD	525
     CALL   DSUB	17 CALL		 0	517 CALL	723
     STORE  Y		18 STORE	25R	518 STORE	525
	...			...			...
X    DEC    5		21		5	521		5
B    BSS    3			-
Y    DEC    LLL		25		13R	525		513
     END    GO
----------------        -------------------     ----------------

Separate Assembly

----------------        -------------------     ----------------
Subroutine
			Entry point table	(assume load @723)
     			   DSUB=0R
     			 External ref. table
     			   X		2
     ENTRY  DSUB	   B		1
     EXTRN  X,B
DSUB STORE  Z		 0 STORE	13R	723 STORE	736
D1   ADD    B+2		 1 ADD	 	2	724 ADD		524
     MPY    X		 2 MPY		0	725 MPY		521
	...			...			...
     JUMP   D1		12 JUMP	        1R	735 JUMP	724
Z    BSS    1			-
     END
----------------        -------------------     ----------------


	Notes

	Based on an example by Gear.
	Program is not supposed to make sense.