Intel 8080 Manual

A SERVICE OF

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Assembler Operation

SOSO/S08S

Assembler

3-2

CBASE

EaU

ORG

START:

LOAD

XRA

LOOP:

LDAX

ADC

STAX

OCR

JZ

INX

INX

JMP

NUM1:

DB

DB

DB

NUM2:

DB

DB

DB

NUM3:

DB

END

0100H

CBASE

NUM1,NUM2,NUM3

A

;CLEAR

ACCUMULATOR

B

;LOAD

BYTE

OF

1ST

NO.

M

;ADD

BYTE

OF

2ND

NO.

B

;STORE

RESULT

o

;DONE

IF

REG

0=0

MAIN

;RETURN

TO

MAIN

PROGRAM

B

;INCR

BC

TO

NEXT

BYTE

H

;INCR

HL

TO

NEXT

BYTE

LOOP

;ADD

NEXT

TWO

BYTES

O9OH

;1ST

NUMBER

OBAH

084H

08AH

;2ND

NUMBER

OAFH

032H

003H

START

Once loaded, the ISIS-II assembler performs its operations without further user in-

tervention.

In

this example, both assembly listing

and

object output are requested by

default. The activation sequence

is

as follows:

-ASMBO

MBADD.SRC

SYMBOLS

XREF

MACROFILE

The source file is specified as MBADD.SRC. The

PRINT

control file defaults to

MBADD.LST. The OBJECT control file defaults

to

MBADD.OBJ. A symbol-

cross-reference listing is also requested

and

macros are present.

The assembly and cross-reference listings

are

shown below. For a detailed explana-

tion

of

each item in these listings, see Chapter 4.

-ASM80

MADD.SRC

SYMBOLS

XREF

MACROFILE

ISIS-II

8080/8085

MACRO

ASSEMBLER,

V2.0

MULTIBYTE

ADDITION

PROGRAM

MBADD

PAGE

1

LOC

OBJ

LINE

SOURCE

STATEMENT

1$ TITLE('MULTIBYTE

ADDITION

PROGRAM')

2

NAME

MBADD

3

LOAD

MACRO

OPD1

,OPD2,COUNT

4L1:

LXI

B,OPD1

;;ADDRESS

OF

1ST

NO.

TO

BC

5

LXI

H,OPD2

;;ADDRESS

OF

2ND

NO.

TO

HL

6

LXI

D,COUNT

;;LOOP

CONTROL

COUNT

TO

D

7

EN

OM

8

CSEG

9

PUBLIC

NUM1,NUM2,NUM3

10

EXTRN

MAIN

0100

11

CBASE

EaU

0100H

0100

12

ORG

CBASE

13

START:

LOAD

NUM1,NUM2,NUM3

0100

011601

C 14+

L1~

LXI

B,NUM1

0103

211901

C

15+

LXI

H,NUM2

0106

111C01

C 16+

LXI

D,NUM3

0109

AF

17

XRA

A

;CLEAR

ACCUMULATOR

100A

OA

18

LOOP:

LDAX

B

;LOAD

BYTE

OF

1ST

NO.

010B

8E

19

ADC

M

;ADD

BYTE

OF

2ND

NO.

010C

02

20

STAX

B

;STORE

RESULT

0100

15

21

OCR

0

;OONE

IF

REG

0 = 0

010E

CAOOOO

E

22

JZ

MAIN

;RETURN

TO

MAIN

PROGRAM

0111

03

23

INX

B

;INCR

BC

TO

NEXT

BYTE

0112

23 24

INX

H

;INCR

HL

TO

NEXT

BYTE

0113

C30A01

C

25

JMP

LOOP

;ADD

NEXT

TWO

BYTES

0116

90

26NUM1:

DB

O9OH

;1STNUMBER