Intel 8080 - B4_Page_26

Chapter 6. Programming Techniques
loads the parameter into the accumulator and adds the sum in the C register to the accumulator. The routine
then loops back to pick up the remaining parameters.
Label
PLlST:
PARM1 :
PARM4:
PARM3:
PARM2:
GENAD:
LOOP:
BACK:
Code
LXI
CALL
HALT
OW
Operand
H,PLlST
GENAD
PARM1
OW PARM2
OW PARM3
OW PARM4
OW
DB
DB
DB
DB
XRA
MOV
MOV
INX
MOV
CPI
JZ
MOV
LDAX
ADD
INX
JMP
MOV
RET
END
OFFFFH
6
16
13
82
A
C,A
E,M
H
A,M
OFFH
BACK
D,A
0
C
H
LOOP
A,C
Comment
;LOAD ADDRESS OF
;PARAMETER ADDRESS LIST
;LlST
OF PARAMETER ADDRESSES
;TERMINATOR
;CLEAR ACCUMULATOR
;SAVE CURRENT TOTAL IN C
;GET LOW ORDER ADDRESS BYTE
;OF FIRST PARAMETER
;GET HIGH
ORDER ADDRESS BYTE
;OF FIRST PARAMETER
;COMPARE TO FFH
;IF EQUAL,
ROUTINE IS COMPLETE
;0 AND E NOW ADDRESS PARAMETER
;LOAD ACCUMULATOR WITH PARAMETER
;ADD
PREVIOUS TOTAL
;INCREMENT HAND L TO POINT
;TO NEXT PARAMETER ADDRESS
;GET NEXT PARAMETER
;ROUTINE DONE - RESTORE TOTAL
;RETURN TO CALLING ROUTINE