This command provides for the insertion of control characters in text.
 EDT accepts a circumflex (^) followed by a letter from A to Z, an @, [,
 \, ], ^ or _.  Each of these 32 characters is transformed into a control
 character by subtracting 32 from its ASCII code, thus ^@ becomes NUL, ^A
 becomes SOH, etc.

 Format: [count]^[character]