3.11.1 TTYCTL Class Usage

OBJECT TTY[TTYCTL];

The TTYCTL class implements a set of routines for controlling character-based video terminals and reading terminal keyboards. Procedures contained in this class include writing to the terminal screen, cursor movement, clearing and srolling screen regions, setting display colors (where available), and decoding keyboard input.

NOTICE: It is generally a bad idea to mix writes to the terminal screen using

T3X.WRITE(T3X.SYSOUT, buffer, length)

(or even to T3X.SYSERR) with the TTYCTL output functions. Doing so may interfere with the internal state of the TTYCTL class and cause messed up screen output or other undefined behaviour.

The TTYCTL routines must be initialized by calling TTY.INIT and shut down by calling TTY.FINI.