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SAVE Function in the IBM 3270 Emulation Feature of the IBM Displaywriter

IP.com Disclosure Number: IPCOM000041614D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Clements, SF Motola, PD Swift, SF [+details]

Abstract

A new function, SAVE, has been created for the IBM 3270 Data Stream Compatibility (DSC) feature of the IBM Displaywriter. This function saves the contents of the display screen and transfers it to a diskette. While the SAVE function is being performed, the host computer must not be permitted to update the screen. If the host were permitted to send data while the SAVE was being performed, it would be necessary to provide a duplicate screen buffer in order to preserve the screen data until the SAVE function was completed. Otherwise, the host could write over the screen while it was being saved. This additional memory and the additional coding it would require would be expensive.