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Browse Prior Art Database

Power Paging Assist for 3270 Terminal Emulators

IP.com Disclosure Number: IPCOM000109494D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 42K

Publishing Venue

IBM

Related People

Berg, KD: AUTHOR [+2]

Abstract

A mechanism is provided to allow the end user to define the 3270 terminal emulator two special escape sequences: PSF and PSB (Power Scroll Forward and Power Scroll Backward). Most 3270 full-screen applications provide a single 3270 aid key sequence to scroll forward (usually PF8) and another to scroll backward (usually PF7). When the user enters the PSF key sequence, instead of sending the usual PF8 aid key to the host application, the terminal emulator will send two duplicate scroll forward requests. The emulator marks the state of the emulator as being in PSF mode so that when the full-screen update received in response to the first scroll forward is received it is displayed, but the second screen is kept in holding buffer 1.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Power Paging Assist for 3270 Terminal Emulators

       A mechanism is provided to allow the end user to define
the 3270 terminal emulator two special escape sequences: PSF and PSB
(Power Scroll Forward and Power Scroll Backward).  Most 3270
full-screen applications provide a single 3270 aid key sequence to
scroll forward (usually PF8) and another to scroll backward (usually
PF7).  When the user enters the PSF key sequence, instead of sending
the usual PF8 aid key to the host application, the terminal emulator
will send two duplicate scroll forward requests.  The emulator marks
the state of the emulator as being in PSF mode so that when the
full-screen update received in response to the first scroll forward
is received it is displayed, but the second screen is kept in holding
buffer 1.  If the user next issues a normal scroll forward request,
the contents of holding buffer 1 are instantly transferred to the
display buffer.  If the user issues another PSF request, the double
scroll forward is sent to the host application, while the screen is
instantly updated from holding buffer 1.

      The operation of PSB operates analogously to PSF, with the
exception of a double scroll backward operation being requested on
the host application.  A third escape key sequence must be defined to
permit the user to resynchronize his display with the state of his
terminal as known by the host application.