Browse Prior Art Database

5250 ASCII Terminal Emulation

IP.com Disclosure Number: IPCOM000039063D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Mumper, WT: AUTHOR [+2]

Abstract

Interactive Terminal Facility (ITF) is a program which allows users of S/36 asynchronous communications to connect to host applications and appear as an asynchronous ASCII terminal. ITF allows data from 5250 keyboard entry, test files, library members, or DisplayWrite/36 documents to be sent over an asynchronous communications line. Data received will be displayed at the 5250 terminal and may also be placed in a data file or library member. All ASCII control characters can be generated as well as a break signal. Typically, asynchronous ASCII terminals provide the capability to enter and receive data on the same line and to roll data up and off the screen. To accomplish these capabilities on a 5250 display, ITF provides 17 lines of an unformatted field followed by 2 lines (160 characters) of an input/output (I/O) field.

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5250 ASCII Terminal Emulation

Interactive Terminal Facility (ITF) is a program which allows users of S/36 asynchronous communications to connect to host applications and appear as an asynchronous ASCII terminal. ITF allows data from 5250 keyboard entry, test files, library members, or DisplayWrite/36 documents to be sent over an asynchronous communications line. Data received will be displayed at the 5250 terminal and may also be placed in a data file or library member. All ASCII control characters can be generated as well as a break signal. Typically, asynchronous ASCII terminals provide the capability to enter and receive data on the same line and to roll data up and off the screen. To accomplish these capabilities on a 5250 display, ITF provides 17 lines of an unformatted field followed by 2 lines (160 characters) of an input/output (I/O) field. When data is received, ITF will roll the existing data in the unformatted field and write the received data to the bottom of that field. To determine when data will be rolled and which field to write to, ITF analyzes the received data. All data received prior to a carriage return (CR) is rolled to the unformatted area of the display. If no CR is found, the data is written to the I/O field and the cursor positioned after that data. ASCII control characters are generated by utilizing an ATTN key on the 5250 keyboard. Pressing the ATTN key causes another display to be presented allowing the user to enter one control chara...