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SNA Character String Data Stream Conversion

IP.com Disclosure Number: IPCOM000062536D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Dea, YW: AUTHOR [+2]

Abstract

A method is described to provide the IBM Personal Computer (PC) Network SNA 3270 Emulation Program product with the ability to format a printed output printing on an IBM PC printer as instructed by the SNA Character String (SCS) datastream. The IBM PC Network SNA 3270 Emulation Program is a program product which emulates a 3274 control unit with a 3278/3279 display and a 3287 printer. It connects to the host using a Synchronous Data Link Control (SDLC) line control and the Logical Unit Types 1,2 and 3 subset of the IBM System Network Architecture (SNA) protocol. The SCS controls are EBCDIC control codes that define a datastream. Their primary function is to format a visual presentation medium, such as a printed page printing on a 3287 printer.

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SNA Character String Data Stream Conversion

A method is described to provide the IBM Personal Computer (PC) Network SNA 3270 Emulation Program product with the ability to format a printed output printing on an IBM PC printer as instructed by the SNA Character String (SCS) datastream. The IBM PC Network SNA 3270 Emulation Program is a program product which emulates a 3274 control unit with a 3278/3279 display and a 3287 printer. It connects to the host using a Synchronous Data Link Control (SDLC) line control and the Logical Unit Types 1,2 and 3 subset of the IBM System Network Architecture (SNA) protocol. The SCS controls are EBCDIC control codes that define a datastream. Their primary function is to format a visual presentation medium, such as a printed page printing on a 3287 printer. To emulate the 3287 printer as an SNA Logical Unit Type 1 (LU1) printer, the program product needs to format the received data as instructed by the SCS datastream. A logical formatted page is created by the SCS conversion which is defined by Maximum Print Position, Maximum Page Length, Top Margin, Bottom Margin, Left Margin, Right Margin, Horizontal Tab stops, Vertical Tab stops, and Line Density. Initially, these values are set to a default value. When an SCS Set Horizontal Format or Set Vertical Format or Set Line Density control sequence is received from the host, these values are updated and become effective on the next line or next page of data or will be rejected if the SCS...