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Displaywriter Emulation of a Pc's Keyboard, Display and Media

IP.com Disclosure Number: IPCOM000059887D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Clarke, KA: AUTHOR [+5]

Abstract

An emulation program allows the Displaywriter (DW) to be attached to a Personal Computer (PC) and to execute PC applications. This provides access to PC functions from the DW and a means of transferring files between the PC and the DW. The emulation program is provided with routines that run on a DW and a PC. The program connects the two machines and provides PC functions on the DW. The DW functions as the logical display, keyboard, and media of the PC. This means that the data normally displayed on the PC monochrome display is displayed on the Displaywriter's display. Similarly, keystrokes on the Displaywriter are transmitted to the PC and are processed as if the keys had actually been pressed on the PC's keyboard.

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Displaywriter Emulation of a Pc's Keyboard, Display and Media

An emulation program allows the Displaywriter (DW) to be attached to a Personal Computer (PC) and to execute PC applications. This provides access to PC functions from the DW and a means of transferring files between the PC and the DW. The emulation program is provided with routines that run on a DW and a PC. The program connects the two machines and provides PC functions on the DW. The DW functions as the logical display, keyboard, and media of the PC. This means that the data normally displayed on the PC monochrome display is displayed on the Displaywriter's display. Similarly, keystrokes on the Displaywriter are transmitted to the PC and are processed as if the keys had actually been pressed on the PC's keyboard. The Displaywriter's diskette drives are logically added to the PC configuration and can be accessed by DOS commands and certain DOS applications. Files can also be transferred between the PC diskettes and the Displaywriter diskettes using the DOS copy command. The functions are accumulated by trapping BIOS display and keyboard interrupts on the PC, and by trapping PC DOS function calls that access the Displaywriter diskettes. The PC trap routines communicate with corresponding routines on the DW via a 38.4 baud asynchronous communications connection. The emulation program that runs on the Displaywriter is designed to execute in the Displaywriter's second partition. This provides the Display...