Abstract: Disclosed is a data input/output unit which is equipped with a control device (1), a tape puncher (5), a tape reader (4) and a printer (6), and which is capable of operating even in response to a command from a host computer. The printer (6) is provided with a tab set counter (6ca) for setting a number of spaces. A number equivalent to a predetermined number of spaces is added to a print number set in a bit counter (6cc) of the printer (6) and space print data indicative of a prescribed number of spaces is successively set at the beginning of print data for a line to be printed in a print character register (6cg), thereby making it possible to maintain a predetermined space at the left margin on printing paper.

Abstract: A typewriter having a calculating function, comprising: a keyboard having a plurality of character keys including letter, numeral and arithmetic symbol keys; an arithmetic unit for performing an arithmetic operation designated by at least one of the arithmetic symbol keys, based on plural sets of numeric data each representing a numerical value and entered through the numeral keys; a main control unit for selecting the plural sets of numeric data as operands from among successive sets of data entered corresponding to the sequential operation of the character keys, such that only the set of numeric data which is entered last prior to each operation of any one of the arithmetic symbol keys is regarded as one of the plural sets of numeric data representing the operands, the main control unit directing the arithmetic unit to perform the arithmetic operation based on the selected plural sets of numeric data or operands, and reading out a result of the arithmetic operation from the arithmetic unit; and a printing d

Abstract: A desk top justifying text writing composing machine including automatic encoding and reading control means for operating a desk top justifying reproducing machine, or for operating larger and more sophisticated printing machines capable of automatic justification. The machine will produce unjustified typed lines and will automatically encode for controlling another machine to print justified lines, as a result of a single series of manual keyboard composing operations and automatic code controlled reproducing operations for producing a justified copy of a literal text, respectively.