Browse Prior Art Database

Sharing a Delete Operation Between a Work-Station Controller and Host Processor

IP.com Disclosure Number: IPCOM000060393D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Naatz, DC: AUTHOR [+3]

Abstract

This invention provides a shared processing of a Delete Text operation between a host processor and a work-station controller. The Delete Text operation on a stand-alone word processor is performed as follows: ΠThe operator positions the cursor at one end point of the text to be deleted and presses the DEL key. ΠA prompt is displayed, "Delete What?", and the character the cursor is positioned under is displayed in reverse image. ΠThe operator positions the cursor at the second end point of the text to be deleted. This may be done in a variety of ways and can be on a different screen of data from the first end point. ΠThe operator presses the Enter key. The text between the two end points is deleted. To provide this function as part of a multi-processor system of the figure presented a problem.

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Sharing a Delete Operation Between a Work-Station Controller and Host Processor

This invention provides a shared processing of a Delete Text operation between a host processor and a work-station controller. The Delete Text operation on a stand-alone word processor is performed as follows: OE The operator positions the cursor at one end point of the text to be deleted and presses the DEL key. OE A prompt is displayed, "Delete What?", and the character the cursor is positioned under is displayed in reverse image. OE The operator positions the cursor at the second end point of the text to be deleted. This may be done in a variety of ways and can be on a different screen of data from the first end point. OE The operator presses the Enter key. The text between the two end points is deleted. To provide this function as part of a multi-processor system of the figure presented a problem. For an intelligent display like Displaywriter, a Delete operation that spans more than one screen poses no special problem. The main- store processor 11 of host processor 10 can access the entire document in main store 12, but the work-station controller (WSC) processor 20 has only the current screen to work with. WSC 20 controls remote terminals and printers 30 via multi- drop cable 21. The Delete Text operation is a frequent enough operation that it is necessary to provide it in the WSC in order to provide the necessary performance. However, if part of the text to be deleted was on the screen and another part off the screen, it is necessary to share the operation between the host and the WSC. This sharing of function is accomplished by two data stream commands that enable the host and WSC to communicate on a pending Delete Text operation. The following example illustrates how this sharing of function is accomplished: OE The operator presses the DEL key. OE The WSC OE displays the character in reverse image, OE sets on a bit in the...