Terminal Characteristics

Terminal devices have certain hardware characteristics that are strictly a function of that terminal. The hardware interface through which the terminal connects also has certain characteristics that are strictly under the control of the hardware. Much of this functionality happens outside of the knowledge and control of UOS. However, certain features of different terminals are supported by UOS so that many different forms of terminals and hardware interfaces are supported.

The following flags are used to inform UOS as to the terminal characteristics.

Value	Mnuemonic	Meaning
1	TF_Video	set to indicate that the terminal is a video terminal as opposed to a hardcopy (printer) terminal.
4	TF_Uppercase_Only	set to indicate that the terminal can only process uppercase characters. Otherwise, the terminal can process both uppercase and lowercase characters.

These flags have ramifications for how the input and output filters handle characters.