The Tandem VT6530 is a proprietary terminal used with their Non-Stop(TM)
series of mainframes. These high-reliability machines are popular in the
banking industry. If you've ever used an ATM to get cash, you've
probably used a VT6530.
The terminal itself can operate in three different mode: conversation,
block, and ANSI (VT100). Conversation mode is a simple scrolling text
mode with the addition key buffering and text attributes. In block mode,
text is displayed in a formated screen with special edit fields. ANSI
mode is only used with OSS, Tandem's UNIX wanabe operating layer.