> There’s no real structure to which codes are in which categories, they’re all just kind of randomly scattered Not exactly. Although the 1967 revision muddled

> There’s no real structure to which codes are in which categories, they’re all just kind of randomly scattered Not exactly. Although the 1967 revision muddled things a little, they are grouped by kind:¹ A8.2 The controls that were selected logically fall into four groups: (1) Transmission controls (2) Format effectors (3) Device controls (4) Information separators Within each group the controls are ordered so that the binary and hierarchical order are directly related. ‘Format effectors’ are the controls that move the carriage/printhead/cursor, and ‘device controls’ are basically private-use format effectors (which mostly followed Teletype's and linger as ^S/^Q flow control). ¹ https://www.sensitiveresearch.com/Archive/CharCodeHist/X3.4-1963/index.html https://www.sensitiveresearch.com/Archive/CharCodeHist/X3.4-...