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2.2.2 VT100+ Character Extensions for Serial/UPS

The VT100+ character extensions conform to ANSI conventions for setting client display foreground and background colors. The VT100 standard, approved by the American National Standards Institute, defines meanings to coded sequences of characters passed from computer to terminal, as specified in [VT100]. The VT100+ extensions use the same general format of coded sequences of characters, but assign additional meanings for sequences that were not defined in the VT100 standard. The VT100+ character and key extensions also support selected keyboard keys and graphics characters that are not part of the original VT100 terminal specification. Function keys on a U.S. standard keyboard (101 keys) are not equivalent to similarly named keys on a VT100 terminal keyboard.