Later Apple II models included MouseText, a set of graphical glyphs used for making a TUI.It was the inspiration for BBEdit's shell worksheet. Apple's Macintosh Programmer's Workshop programming environment included Commando, a TUI shell.All Commodore 8-bit computers used the PETSCII character set, which included character glyphs suitable for making a TUI. Users could move the cursor over the entire screen area, entering and editing BASIC program lines, as well as direct mode commands. The full screen editor of the Commodore 64 8-bit computers was advanced in its market segment for its time.Video circuits or modules are usually controlled using VT100-compatible command set over UART, FPGA designs usually allow direct video memory access. This is the worst case, because software restrictions hinder the use of capabilities of a remote display device. The communication capabilities usually become reduced to a serial line or its emulation, possibly with few ioctl()s as an out-of-band channel in such cases as Telnet and Secure Shell. Certain functions of an advanced text mode, such as an own font uploading, almost certainly become unavailable. This usually supports programs which expect a real text mode display, but may run considerably slower. Examples are xterm for X Window System and win32 console (in a window mode) for Microsoft Windows. If not deterred by the operating system, a smart program may exploit the full power of a hardware text mode. This is a normal condition for a locally running application on various types of personal computers and mobile devices. A genuine text mode display, controlled by a video adapter or the central processor itself.From text application's point of view, a text screen (and communications with it) can belong to one of three types (here ordered in order of decreasing accessibility):
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