Browse Prior Art Database

I/O Attention Field Support for 5250 Displays

IP.com Disclosure Number: IPCOM000119225D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Eagen, ST: AUTHOR [+4]

Abstract

Described is an extension to 5250 display data stream architecture to improve 3270 architecture compatibility. The new I/O Attention field provides selectable field support on 5250 displays that is functionally compatible with that provided on 3270 displays. This enables AS/ 400* 3270 Device Emulation to support the emulation of 3270 selectable fields.

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I/O Attention Field Support for 5250 Displays

      Described is an extension to 5250 display data stream
architecture to improve 3270 architecture compatibility. The new I/O
Attention field provides selectable field support on 5250 displays
that is functionally compatible with that provided on 3270 displays.
This enables AS/ 400* 3270 Device Emulation to support the emulation
of 3270 selectable fields.

      It is common for AS/400 systems to communicate with IBM System/
370* (S/370) systems and for AS/400 display users to pass through to
a host S/370 system to run S/370 applications.  This is supported by
an AS/400 operating system component called 3270 Device Emulation
(3270DE).

      The flow of data in this type of user environment is
illustrated in Fig. 1.

      In this environment, the AS/400 acts like a remote work station
controller (WSC) to the S/370.  The S/370 application communicates
with 3270DE via a 3270 data stream. 3270DE translates this data
stream into a 5250 data stream when sending data outbound to the WSC,
and vice versa when transmitting data inbound to the S/370 host.
This data stream translation enables the AS/400 user to run S/370
applications.

      The 5250 selectable field is defined differently and operates
differently from 3270 selectable fields.  Until now, these
differences have prevented 3270DE from supporting 3270 selectable
fields.

      Input fields are defined in the 5250 data stream by using the
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