Browse Prior Art Database

Method to Provide Virtual Terminal Support for Multiple Real Terminals

IP.com Disclosure Number: IPCOM000039287D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Baker, DC: AUTHOR [+2]

Abstract

The Virtual Resource Manager (VRM) supports multiple operating systems "simultaneously." The virtual terminal subsystem, a part of the VRM, provides the ability to interact with a single user on the real terminal, comprising a keyboard, one or more displays, and, optionally, a locator, all directly attached to the CPU. The operating systems may be either single user or multiuser; however, any additional users of multiuser operating systems must interact using remote terminals, which present slower and lower function interaction characteristics. In this new method the virtual terminal subsystem can support multiple users via multiple real terminals, each with its components directly attached to the CPU. Each additional real terminal provides the same performance and level of function as the first, e.g.

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Method to Provide Virtual Terminal Support for Multiple Real Terminals

The Virtual Resource Manager (VRM) supports multiple operating systems "simultaneously." The virtual terminal subsystem, a part of the VRM, provides the ability to interact with a single user on the real terminal, comprising a keyboard, one or more displays, and, optionally, a locator, all directly attached to the CPU. The operating systems may be either single user or multiuser; however, any additional users of multiuser operating systems must interact using remote terminals, which present slower and lower function interaction characteristics. In this new method the virtual terminal subsystem can support multiple users via multiple real terminals, each with its components directly attached to the CPU. Each additional real terminal provides the same performance and level of function as the first, e.g., each has a potential 32 virtual terminals. The reconfiguration ability of the virtual terminal subsystem allows the user and/or the operating system(s) to allocate interactive I/O devices to the real terminals in the desired manner. The only requirement is that each real terminal have a keyboard and one display. To create an additional real terminal, the operating system must define an instance of the Resource Controller component of the virtual terminal subsystem. The operating system must first issue a Define Code Supervisor Call (SVC) with the duplicate option to copy the Resource Controller...