High speed basic and condensed tab racks

摘要

In a high speed trail printer an improved electronic tab rack is provided. A method and apparatus are disclosed for decreasing the time required to determine the location of the next tab involving accessing a condensed tab rack. The condensed tab rack is set up when the tabs are entered and contains for each byte of the basic tab rack one bit indicating whether or not the associated tab rack byte specifies at least one tab stop position.