2(Assembler)

START

END

BYTE

WORD

RESB

RESW

2.1

(F1)(05)

,X

.

SIC

RDREC-

WRREC-

1. 10

STL14

2. 10

RETADR1033

3.

4.

80EOF454F46

5.

2.1.1 SIC

2.1

(forward reference)

(RETADR)

2.1.1 SIC

2.1

??

2.1.1 SIC

2.1

STARTEND

BYTEWORD

RESBRESW

2.1.1 SIC

2.1

1 H

27

813 (3bytes)16

1419 (3bytes)

1 T

27

89 ()

1069 16

2.1.1 SIC

2.1

1 E

27

2.2

2.1.1 SIC

2.1

10

1.

2.

3.

BYTERESW

2.1.1 SIC

2.1

1.

2. BYTEWORD16

3.

4.

2.1.1 SIC

2.1

(Operation Code Table; OPTAB)

(Symbol Table; SYMTAB)

(Location Counter ; LOCCTR)

START

2.1.2

2.1

OPTAB

Hash Tablekey

SYMTAB

, , ()

BYTE, WORD, RESB, RESW

Hash TableHash Function

SYMTAB

(literals)

SIC/XE

@OPCODE @SYMBLE

OPCODE #SYMBLE

:

BASEBASE SYMBLE#

+(format 4)+OPCODE SYMBLE

34

2.2

PC-relativeBase-relative

PC-relative

PC-relativeBase-relative

PC-relativeBase-relative+format 4

PC-relativeBase-relative+

2.2.1

2.2

RDREC-

WRREC-

1036e 1 full address

15 0006 CLOOP +JSUB RDREC 4B101036

010010 1 1 0 0 0 1 0000 0001 0000 0011 0110

4 B 1 0 1 0 3 6

op(6) n i x b p e disp(20)

10 0000 FIRST STL RETADR 17202D

disp= RETADR -PC = 30-3 = 2D

40 0017 J CLOOP 3F2FEC

disp= CLOOP -PC = 6 -1A = -14 = FEC

-14=1111 1110 1011+1=FEC

12 0003 LDB #LENGTH 69202D

13 BASE LENGTH

160 104E STCH BUFFER,X 57C003

175 1056 EXIT STX LENGTH 134000

BASEBASE

NOBASEBASE

disp= BUFFER-PC=0036-1051= -101B -101BBASE-related disp= BUFFER-B=0036-0033=3

disp= LENGTH-PC=0033-1059= -1026 disp= LENGTH-B=0033-0033=0

55 0020 LDA #3 010003

133 103C +LDT #4096 75101000

4096=(01000)16

12 0003 LDB #LENGTH 69202D

LENGTHLENGTHB

LENGTH=0033=PC+displ=0006+02D

70 002A J @RETADR 3E2003

5 0000 COPY START 0

10 0000 FIRST STL RETADR 17202D

displacement= RETADR -PC = 30-3 = 2D

12 0003 LDB #LENGTH 69202D

(immediate operand)LENGTH

LENGTH B

LENGTH=0033=PC+displacement=0006+02D

if immediate mode is specified, the target address becomes the

operand

(B)=0033

13 BASE LENGTH

15 0006 CLOOP +JSUB RDREC 4B101036

Op code + n i x b p e + 20bit displacement

48 (1 1) (0 0 0 1) + 01036() 20 000A LDA LENGTH 032026

0033=000D+disp

Op code + n i x b p e + 12bit displacement

00 (1 1) (0 0 1 0) + 026

25 000D COMP #0 290000

op code + n i x b p e + 12bit displacement

28 (0 1) (0 0 0 0) + 000

30 0010 JEQ ENDFIL 332007

001A=0013+disp

Op code + n i x b p e + 12bit displacement

30 (1 1) (0 0 1 0) + 007

35 0013 +JSUB WRREC 4B10105D Op code + n i x b p e + 20bit displacement

48 (1 1) (0 0 0 1) + 0105D()

40 0017 J CLOOP 3F2FEC displacement= CLOOP -PC = 6 -1A = -14 = FEC

0006=001A+disp

Op code + n i x b p e + 12bit displacement

3C (1 1) (0 0 1 0) + FEC

45 001A ENDFIL LDA EOF 032010 002D=001D+disp

Op code + n i x b p e + 12bit displacement

00 (1 1) (0 0 1 0) + 010

50 001D STA BUFFER 0F2016 0036=0020+disp

Op code + n i x b p e + 12bit displacement

0C (1 1) (0 0 1 0) + 016

RDREC

WRREC

2.2.2 (Relocation)

2.2

2.300102D 102DA

102D()THREE

2000h

2.2.2

2.2

55 101B LDA THREE 00102D

2-2SIC

55 201B LDA THREE 00102D

1M

27 16

89 16

JSUB

M00000705

(byte)

(nibble

2.6

Relocation

SIC

SIC/XE

immediate addressing,

PC-relative, BASE-relative,