Figure B-1 represents the ASCII character set (characters with decimal values 0 through 127). The first half of each of the numbered columns identifies the character as you would enter it on a terminal or as you would see it on a printer. Except for SP and HT, the characters with names are nonprintable. In Figure B-1, the characters with names are defined as follows:
| NUL | Null | DC1 | Device Control 1 (XON) |
| SOH | Start of Heading | DC2 | Device Control 2 |
| STX | Start of Text | DC3 | Device Control 3 (XOFF) |
| ETX | End of Text | DC4 | Device Control 4 |
| EOT | End of Transmission | NAK | Negative Acknowledge |
| ENQ | Enquiry | SYN | Synchronous Idle |
| ACK | Acknowledge | ETB | End of Transmission Block |
| BEL | Bell | CAN | Cancel |
| BS | Backspace | EM | End of Medium |
| HT | Horizontal Tab | SUB | Substitute |
| LF | Line Feed | ESC | Escape |
| VT | Vertical Tab | FS | File Separator |
| FF | Form Feed | GS | Group Separator |
| CR | Carriage Return | RS | Record Separator |
| SO | Shift Out | US | Unit Separator |
| SI | Shift In | SP | Space |
| DLE | Data Link Escape | DEL | Delete |
The remaining half of each column identifies the character by the binary value of the byte; the value is stated in three radixes- octal, decimal, and hexadecimal. For example, the uppercase letter A has, under ASCII conventions, a storage value of hexadecimal 41 (a bit configuration of 01000001), equivalent to 101 in octal notation and 65 in decimal notation.
The ASCII character set comprises the first half of the DEC Multinational Character Set. Figure B-2 represents the second half of the DEC Multinational Character Set (characters with decimal values 128 through 255). The first half of each of the numbered columns identifies the character as you would see it on a terminal or printer (these characters cannot be output on some older terminals and printers). The characters with names are nonprintable. In Figure B-2, the characters with names are defined as follows:
| IND | Index | PU1 | Private Use 1 |
| NEL | Next Line | PU2 | Private Use 2 |
| SSA | Start of Selected Area | STS | Set Transmit State |
| ESA | End of Selected Area | CCH | Cancel Character |
| HTS | Horizontal Tab Set | MW | Message Waiting |
| HTJ | Horizontal Tab Set with Justification | SPA | Start of Protected Area |
| VTS | Vertical Tab Set | EPA | End of Protected Area |
| PLD | Partial Line Down | CSI | Control Sequence Introducer |
| PLU | Partial Line Up | ST | String Terminator |
| RI | Reverse Index | OSC | Operating System Command |
| SS2 | Single Shift 2 | PM | Privacy Message |
| SS3 | Single Shift 3 | APC | Application |
| DCS | Device Control String |
The shaded boxes in Figure B-2 indicate positions that are not part of the character set.
