Character Set
The operating systems for the CDC 3xxx typically used 6 bit characters, so the 64 character set did not contain lowercase letters. The character set contained (in display code order). This 6-bit extension of the 4-bit BCD encoding was referred to as BCDIC (BCD interchange code.) IBM later extended this code further to create the 8-bit "extended BCDIC", or EBCDIC code.
: A-Z 0-9 + - * / ( ) $ = (space), . # % " _ ! & ' ? < > @ \ ^ ;Depending on the device, some characters are rendered differently, especially the lineprinter and some terminals:
| character | sometimes displays as |
| # | ≡ |
| " | ≠ |
| _ | → or { |
| ! | ∨ |
| & | ∧ |
| ' | ↑ |
| ? | ↓ or } |
| @ | ≤ |
| \ | ≥ |
| ^ | ¬ |
Note the absence of control characters, especially carriage return and line feed. These were encoded by the record structure.
Read more about this topic: CDC 3000
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