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If your system passes the codes directly to the printer without changing
them, you will get a printout like Figure 2-3.
00 01 02 03 04 05
06 07 08 09 OA 08 OC OD OE
OF
10 11 12 13 14 15
16 17 18 19 1A 18 1C 1D 1E
1F
20 21 22 23 24 25
26 27 28 29 2A 25 2C 2D 2E
ZF
30 31 32 33 34 35
36 37 38 39 3A 38 3C 30 3E
3F
40 41 42 43 44 45
46 47 48 49 4A 46 4C 40 4E
4F
50 51 52 53 54 55
56 57 58 59 5A 58 5C SD 5E
5F
60 61 62 63 64 b5
66 67 68 69 6A 66 6C 60 6E
6F
70 71 72 73 74 75
76 77 78 79 7A 78 7C 70 7E
7F
80 81 82 83 84 85
86 87 88 89 8A 86 8C 8D 8E
8F
90 91 92 93 94 95
96 97 98 99 9A 96 9C 9D 9E
9F
A0 Al A2 A3 A4 A5 A6 A7
A8 A9 AA AB AC AD AE AF
BO 81 62 63 84 R5
66 87 BE 69 BA 88 BC BD BE
BF
CO Cl C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF
ii Dl 02 D3 D4 D5 06 07
D8 D9 DA D8 DC DD DE DF
EO El E2 E3 E4 ES E6 E7
E8 E9 EA EB EC ED EE EF
FO Fl F2 F3 F4 F5 F6 F7
F8 F9 FA FB FC FD FE FF
OD OA
. . . . . . . . .
‘p#&; ijx;;;:;
01234567 89:;<=>?
@ABCDEFG HIJKLMNO
PQRSTUVW XYZ[\I--
‘abcdefg hijklmno
pqrstuvw xyz{;)-o
. . . . . .
. . . . . ..r
______..
. . . .
.
_....... . . . .
. . . . . . . . . . . .
I
Figure 2-3. Sample hexadecimal dump
Most BASICS, however, are not quite that straightforward. For example,
-
the IBM-PC prints the following.
00 01
02 03 04
05
06 07 08 09 OA 08
OC OD OA
OE
OF 10
11 12 13
14
15 16 17 18 19 18
1C 1D 1E
1F
20 21
22 23 24
25
26 27 28 29 2A 2B
2C 20 2E
2F
30 31
32 33 34
35
36 37 38 39 3A 38
3C 30 3E
3F
40 41
42 43 44
45
46 47 48 49 4A 46
4C 40 4E
4F
50 51
52 53 54
55
56 57 58 59 5A 58
5C 5D 5E
5F
60 61
62 63 64
65
66 67 68 69 6A 68
6C 60 6E
6F
70 71
72 73 74
75
76 77 78 79 7A 78
7C 7D 7E
7F
80 81
82 83 84
85
86 87 88 89 8A 8B
8C 8D 8E
8F
90 91
92 93 94
95
96 97 98 99 9A 96
9C 9D 9E
9F
A0 Al A2 A3 A4 A5 A6 A7
A8 A9 AA AB AC AD AE AF
80 Bl
82 83 84
B5
86 87 B8 69 BA BB
BC BD BE
BF
CO Cl C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF
DO Dl 02 D3 D4 D5 D6 D7
D8 D9 DA 08 DC DD DE DF
EO El E2 E3 E4 E5 E6 E7
EB E9 EA Ei3 EC ED EE EF
FO Fl F2 F3 F4 F5 F6 F7
F8 F9 FA FB FC FD FE FF
OD OA
........
........
! “UP%&
01234567
PABCDEFG
~QRSTUV~
‘abcdefg
pqrstuvw
.
.
. .
.
. . .
.
o*+.--/
89: I<=>?
HI JKLMNO
xyz[\l--
hijklmno
XYZCll-0
. . .
. .
.
.
.
figure 2-4. Sample hexadecimal dump with IBM-PC
When the IBM-PC BASIC interpreter sends hex code OD (carriage re-
turn) it adds an extra hex OA (line feed). Hex code 1 A (end-of-file) also gets
special treatment: the interpreter does not send it at all. This can cause
problems in programs that generate graphics or download character data,
but there is a solution. Try changing line 20 in the preceding program and
adding the coding shown below.
Coding for IBM-PC with monochrome display:
20 GOSUB 100
100 O=INP(&H3BD)
:IF 0<128 THEN 100
110 OUT tH3BC,I
:OUT &H3BE,5 :OUT &H3BE,4
120 RETURN
24