Browse Prior Art Database

Subroutine Image Sharing

IP.com Disclosure Number: IPCOM000092581D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Criscimagna, TN: AUTHOR [+4]

Abstract

This method permits a subroutine image to be stored in a single location and utilized by multiple display units under control of a host control unit. This technique conserves storage space in the control unit. This is because the data need be stored only once and can be utilized by each display unit connected to the control unit. Such data can, for example, comprise format data, identification data, and any other data common to two or more displays. This technique can either be substituted for rear projection CRT'S or utilized in place of overlays for vastly improved performance.

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Subroutine Image Sharing

This method permits a subroutine image to be stored in a single location and utilized by multiple display units under control of a host control unit. This technique conserves storage space in the control unit. This is because the data need be stored only once and can be utilized by each display unit connected to the control unit. Such data can, for example, comprise format data, identification data, and any other data common to two or more displays. This technique can either be substituted for rear projection CRT'S or utilized in place of overlays for vastly improved performance.

The host control unit includes a buffer which stores the display data for each CRT display unit in program assigned addresses. The shared data is stored by the display program in a separate area accessible by all display programs. The display programs stored in the assigned sections of the buffer are in this tabular form.

(Image Omitted)

The host unit cycles through each buffer program on an as required basis for each display unit in an interleaved manner. Upon reading address X + n + 1 for display 1, the decoded buffer data transfers image regeneration for display 1 to the Subroutine Image Buffer Program at buffer address Z on the next buffer cycle for display 1 and stores address X + n + 3 in an assigned address of a bump storage section of the control unit. The next subsequent buffer cycle for display 1 reads address Z and following cycles present the common s...