kode sbcdic
TRANSCRIPT
KODE YG MEWAKILI DATA
Komputer Generasi-1 : 1 byte = 4 bit -> BCD
Komputer Generasi-2 : 1 byte = 6 bit -> SBCDIC
Komputer Generasi Skr : 1 byte = 8 bit, 16, 32, 64,128 byte
:-> EBCDIC, ASCII-7/8
1. BCD
2. SBCDIC
3. EBCDIC
4. ASCII-7
5. ASCII-8
1. BCD (Binary Code Decimal)
BCD = Binary Code Decimal
1 byte = 4 bit, 24 kombinasi = 16 kombinasi kode
dari kombinasi hy 10 yg dipake
DESIMAL KODE BCD
0 0 0 0 0
1 0 0 0 1
2 0 0 1 0
3 0 0 1 1
4 0 1 0 0
5 0 1 0 1
6 0 1 1 0
7 0 1 1 1
8 1 0 0 0
9 1 0 0 1
10
11
12
13
14
15
� Data disimpan di computer pd main memory untuk di proses
2. SBCDIC
SBCDIC = Standard Binary Coded Decimal Interchange Code
1 byte = 6 bit, 26 kombinasi = 64 kombinasi kode
10 angka
26 huruf besar
28 simbol khusus
Kode SBCDIC di bagi 2 Zone
1. Zone Alphabet (AB)
2. Zone Numerik (8 4 2 1)
Alphabet numeric
A B 8 4 2 1
AB
00 : angka (0-9)
11 : huruf (A-I)
10 : huruf (J-R)
01 : huruf (S-Z)
BCD 6 0110
SBCDIC 6 00 0110
TABEL SBCDIC
0-9 A-I
A B 8 4 2 1 CHAR A B 8 4 2 1 CHAR
0 0 0 0 0 0 0 1 1 0 0 0 1 A
0 0 0 0 0 1 1 1 1 0 0 1 0 B
0 0 0 0 1 0 2 1 1 0 0 1 1 C
0 0 0 0 1 1 3 1 1 0 1 0 0 D
0 0 0 1 0 0 4 1 1 0 1 0 1 E
0 0 0 1 0 1 5 1 1 0 1 1 0 F
0 0 0 1 1 0 6 1 1 0 1 1 1 G
0 0 0 1 1 1 7 1 1 1 0 0 0 H
0 0 1 0 0 0 8 1 1 1 0 0 1 I
0 0 1 0 0 1 9
J-R S-Z
A B 8 4 2 1 CHAR A B 8 4 2 1 CHAR
1 0 0 0 0 1 J 0 1 0 0 1 0 S
1 0 0 0 1 0 K 0 1 0 0 1 1 T
1 0 0 0 1 1 L 0 1 0 1 0 0 U
1 0 0 1 0 0 M 0 1 0 1 0 1 V
1 0 0 1 0 1 N 0 1 0 1 1 0 W
1 0 0 1 1 0 O 0 1 0 1 1 1 X
1 0 0 1 1 1 P 0 1 1 0 0 0 Y
1 0 1 0 0 0 Q 0 1 1 0 0 1 Z
1 0 1 0 0 1 R
3. EBCDIC
� EBCDIC = Extended Binary Coded Decimal Interchange Code
� 1 byte = 8 bit
� Kombinasi 28 = 256 kombinasi
� Di bagi dlm beberapa Zone yaitu sbb :
o High-Order Bits dan
o Low-Order Bits
Zone EBCDIC
1 2 3 4 5 6 7 8
8 4 2 1
1-4 : High-Order Bits (Zone Bits) 5-8 : Low-Order Bits (Numeric Bits)
Ketentuan :
Zone Bits 1,2 :
11 : huruf besar (capital) dan numeric
10 : huruf kecil
01 : karakter khusus
00 : tdk ada karakter yg diwakili
Zone Bits 3,4 :
00 : A - I
01 : J – R
10 : S - Z
11 : numeric 0-9
Char BDC SBCDIC EBCDIC
A - 110001 1100 0001
6 0110 000110 1111 0110