Character and Op Codes
The table is in Character Collating Sequence.
- Note: If Word mark bit is set, then the C bit will be opposite of shown. Of course, the C bit was determined and checked automatically by the machine - normally it was of no concern to the programmers. The only way the C bit could be entered was by manually using the switches on the Auxiliary Console. A programmer might use these switches to make quick patches while debugging.
This article contains special characters. Without proper rendering support, you may see question marks, boxes, or other symbols. |
BCD Character | Print-A | Print-H | Card | BCD
w/o M |
Operation | Definition & Notes |
---|---|---|---|---|---|---|
Blank | C | |||||
. | . | . | 12-3-8 | BA8 21 | Halt | |
¤ | ¤ | ) | 12-4-8 | CBA84 | Clear Word Mark | Lozenge |
[ | 12-5-8 | BA84 1 | ||||
< | 12-6-8 | BA842 | Less Than | |||
12-7-8 | CBA8421 | Group Mark | ||||
& | & | + | 12 | CBA | ||
$ | $ | $ | 11-3-8 | CB 8 21 | ||
* | * | * | 11-4-8 | B 84 | ||
] | 11-5-8 | CB 84 1 | ||||
; | 11-6-8 | CB 842 | ||||
Δ | 11-7-8 | B 8421 | Delta (Mode Change) | |||
- | - | - | 11 | B | ||
/ | / | / | 0-1 | C A 1 | Clear Storage | |
, | , | , | 0-3-8 | C A8 21 | Set Word Mark | |
% | % | ( | 0-4-8 | A84 | Divide | Optional special feature. |
ˠ | 0-5-8 | C A84 1 | Word Separator | |||
\ | 0-6-8 | C A842 | Left Oblique | |||
⧻ | 0-7-8 | A8421 | Tape Segment Mark | |||
ƀ | ‡ | ‡ | N/A
0 |
A | Cannot be read from card without a no-cost RPQ, in which case it is read as 8-2.
Punches as zero. Blank with "even-parity" on tape. |
|
# | # | = | 3-8 | 8 21 | Modify Address | Optional (requires more than
4000 characters of memory) |
@ | @ | ' | 4-8 | C 84 | Multiply | Optional special feature. |
: | 5-8 | 84 1 | ||||
> | 6-8 | 842 | Greater Than | |||
√ | 7-8 | C 8421 | Tape Mark | |||
? | & | & | 12-0 | CBA8 2 | Zero and Add | Plus Zero |
A | A | A | 12-1 | BA 1 | Add | |
B | B | B | 12-2 | BA 2 | Branch | |
C | C | C | 12-3 | CBA 21 | Compare | |
D | D | D | 12-4 | BA 4 | Move Numerical | (Bits) |
E | E | E | 12-5 | CBA 4 1 | Move Characters and Edit | |
F | F | F | 12-6 | CBA 42 | Control Carriage | (Printer) |
G | G | G | 12-7 | BA 421 | ||
H | H | H | 12-8 | BA8 | Store B-Address Register | Optional special feature. |
I | I | I | 12-9 | CBA8 1 | ||
! | - | - | 11-0 | B 8 2 | Zero and Subtract | Minus Zero |
J | J | J | 11-1 | CB 1 | ||
K | K | K | 11-2 | CB 2 | Select Stacker and other device controls | (Card and some others) |
L | L | L | 11-3 | B 21 | Load Characters to Word Mark | |
M | M | M | 11-4 | CB 4 | Move Characters to Word Mark | |
N | N | N | 11-5 | B 4 1 | No Operation | |
O | O | O | 11-6 | B 42 | ||
P | P | P | 11-7 | CB 421 | Move Characters to
Record or Group Mark |
Optional special feature. |
Q | Q | Q | 11-8 | CB 8 | Store A-Address Register | Optional special feature. |
R | R | R | 11-9 | B 8 1 | ||
‡ | ‡ | ‡ | 0-2-8 | A8 2 | Record Mark | |
S | S | S | 0-2 | C A 2 | Subtract | |
T | T | T | 0-3 | A 21 | Translate | (1460 only) |
U | U | U | 0-4 | C A 4 | Control Unit | (Tape) |
V | V | V | 0-5 | A 4 1 | Branch if Word Mark
and/or Zone |
|
W | W | W | 0-6 | A 42 | Branch if Bit Equal | Optional special feature. |
X | X | X | 0-7 | C A 421 | Move and Insert Zeros | Optional special feature. |
Y | Y | Y | 0-8 | C A8 | Move Zone | (Bits) |
Z | Z | Z | 0-9 | A8 1 | Move Characters and
Suppress Zeros |
|
0 | 0 | 0 | 0 | C 8 2 | ||
1 | 1 | 1 | 1 | 1 | Read a Card | |
2 | 2 | 2 | 2 | 2 | Write a Line | |
3 | 3 | 3 | 3 | C 21 | Write and Read | |
4 | 4 | 4 | 4 | 4 | Punch a Card | |
5 | 5 | 5 | 5 | C 4 1 | Read and Punch | |
6 | 6 | 6 | 6 | C 42 | Write and Punch | |
7 | 7 | 7 | 7 | 421 | Write, Read, and Punch | |
8 | 8 | 8 | 8 | 8 | Start Read Feed | Optional special feature. |
9 | 9 | 9 | 9 | C 8 1 | Start Punch Feed | Optional special feature. |
Read more about this topic: IBM 1401
Famous quotes containing the words character and/or codes:
“The actor should not play a part. Like the Aeolian harps that used to be hung in the trees to be played only by the breeze, the actor should be an instrument played upon by the character he depicts.”
—Alla Nazimova (18791945)
“Thou hast a voice, great Mountain, to repeal
Large codes of fraud and woe; not understood
By all, but which the wise, and great, and good
Interpret, or make felt, or deeply feel.”
—Percy Bysshe Shelley (17921822)