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
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