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Browse Prior Art Database

Paging Using the Work Station Emulation Hardware

IP.com Disclosure Number: IPCOM000034155D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-26
Document File: 4 page(s) / 156K

Publishing Venue

IBM

Related People

Klingsporn, RA: AUTHOR [+4]

Abstract

This invention allows paging of Work Station Emulation (WSE) information to and from its hardware on a high performance demand basis, therefore, reducing the IBM PC (personal computer) memory requirements. (Image Omitted) There are several types of hardware available that provide PC memory swapping. This hardware provides a PC memory-saving technique without burdening the customer with the additional expense of the memory-swapping hardware. This hardware requires no additional hardware other than the already-purchased WSE communications card. The current method saves up to 80 KB of PC memory. It is re-entrant to support multiple simultaneous paging requests.

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Paging Using the Work Station Emulation Hardware

This invention allows paging of Work Station Emulation (WSE) information to and from its hardware on a high performance demand basis, therefore, reducing the IBM PC (personal computer) memory requirements.

(Image Omitted)

There are several types of hardware available that provide PC memory swapping. This hardware provides a PC memory-saving technique without burdening the customer with the additional expense of the memory-swapping hardware. This hardware requires no additional hardware other than the already-purchased WSE communications card. The current method saves up to 80 KB of PC memory. It is re-entrant to support multiple simultaneous paging requests. Backround Information As application software grows and computer users keep several different pieces of software resident in their computers, computer memory becomes a critical resource. In order to help alleviate this situation and reduce the PC memory requirements of the WSE product, a paging technique was developed to use the WSE communications card and fit within the framework of the interprocessor communications protocol.

The basic concept of the paging technique is to keep only the information that is immediately needed by the PC in memory and the rest on a fast secondary device. As the paged out information is needed, it is brought in from the secondary device to reusable main memory.

(Image Omitted)

Features of this Hardware

* Requires no special paging hardware or software.

* 80K bytes per second end to end data transfer rate on an IBM PC

XT computer.

* Save/restore area is invisible to PC memory address space.

* Usable by any WSE PC task.

* The data request can vary from 1 byte within a 4K page to a

single request for multiple pages. Before a good understanding of how paging is accomplished with the WSE hardware, a basic overview of the adapter card architecture is needed. The adapter card is actually a single board computer that resides within the PC. Following is a list of the basic components that make up this card. * Intel 8088C Micro Processor running at 8 MHz

* Interrupt Cont...