304
Conversion Instructions
Section 5-20
Some examples of Di values and the 8-bit ASCII to 4-bit hexadecimal conver-
sions that they produce are shown below.
ASCII Code Table
The following table shows the ASCII codes before conversion and the hexa-
decimal values after conversion. Refer to
Appendix H
for a table of ASCII
characters.
Note
The leftmost bit of each ASCII code is adjusted for parity.
Parity
The leftmost bit of each ASCII character (2 digits) is automatically adjusted for
either even or odd parity.
With no parity, the leftmost bit should always be zero. With odd or even parity,
the leftmost bit of each ASCII character should be adjusted so that there is an
odd or even number of ON bits.
0
1
2
3
D
Di: 0011
S
Di: 0030
Di: 0133
Di: 0023
1st byte
2nd byte
S
1st byte
2nd byte
S+1
1st byte
2nd byte
0
1
2
3
D
S
1st byte
2nd byte
S+1
1st byte
2nd byte
0
1
2
3
D
S
1st byte
2nd byte
S+1
1st byte
2nd byte
0
1
2
3
D
S+2
1st byte
2nd byte
Original data
Converted data
ASCII Code
Bit status (See note.)
Digit
Bits
30
*
0
1
1
0
0
0
0
0
0
0
0
0
31
*
0
1
1
0
0
0
1
1
0
0
0
1
32
*
0
1
1
0
0
1
0
2
0
0
1
0
33
*
0
1
1
0
0
1
1
3
0
0
1
1
34
*
0
1
1
0
1
0
0
4
0
1
0
0
35
*
0
1
1
0
1
0
1
5
0
1
0
1
36
*
0
1
1
0
1
1
0
6
0
1
1
0
37
*
0
1
1
0
1
1
1
7
0
1
1
1
38
*
0
1
1
1
0
0
0
8
1
0
0
0
39
*
0
1
1
1
0
0
1
9
1
0
0
1
41
*
1
0
1
0
0
0
1
A
1
0
1
0
42
*
1
0
1
0
0
1
0
B
1
0
1
1
43
*
1
0
1
0
0
1
1
C
1
1
0
0
44
*
1
0
1
0
1
0
0
D
1
1
0
1
45
*
1
0
1
0
1
0
1
E
1
1
1
0
46
*
1
0
1
0
1
1
0
F
1
1
1
1
