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Variable Image Generation Cycle and Error Print in Text Printer

IP.com Disclosure Number: IPCOM000046859D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 62K

Publishing Venue

IBM

Related People

Kida, M: AUTHOR [+3]

Abstract

This article describes a variable image generation cycle in a text printer by counting the number of character codes included in one-line print data, and it also describes an error mark print in a margin area of a print sheet. A document distribution network system includes a host computer, communication or transmission line and various I/O terminals, such as, text printer, display terminal, etc. Particularly, the text printer had to have a high speed print capability along with an error detection capability. The text data stream for the text printer is assembled by the host computer or the text terminal under an architecture capable of adapting a format of the control codes and the character codes to particular operational parameters or functions of the text printer.

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Variable Image Generation Cycle and Error Print in Text Printer

This article describes a variable image generation cycle in a text printer by counting the number of character codes included in one-line print data, and it also describes an error mark print in a margin area of a print sheet. A document distribution network system includes a host computer, communication or transmission line and various I/O terminals, such as, text printer, display terminal, etc. Particularly, the text printer had to have a high speed print capability along with an error detection capability. The text data stream for the text printer is assembled by the host computer or the text terminal under an architecture capable of adapting a format of the control codes and the character codes to particular operational parameters or functions of the text printer. The text data stream includes plural-line print data, each of which includes control codes and character codes representing one-line message of text. There were two problems associated with prior devices and techniques. The first problem was that the print speed per one print line of the prior text printer was fixed, that is, the image generation cycle was designed to always repeat from the first column or character position to the last column or character position over the maximum length of one print line on a print sheet. The second problem was that a re-send of the text data stream from the host computer to the text printer or a provision of error correction or recovery function to the text printer was required to correct an error in the text data stream. Fig. 1 shows a block diagram of the text printer which solves these problems, and Fig. 2 shows a print sheet with error marks. The text data stream is supplied to an end-of-line sensor 1 through an input data line. The end-of-line sensor partitions the text data stream into the plural line print data by sensing the end-of-line codes and supplies the character codes in one line print data to an error detection circuit 2, which compares the control codes, the character codes and the format thereof with the reference data, i.e., control codes, character codes and format, each of which is supported by or assigned to this text printer, in order to detect an error in the line print data. When the error detection circuit 2 detects an error in the line print data, it sets an error flag into an error flag register 3. The character codes in the line print data are supplied to a code converter 4 from the er...