Data Compression for Displaywriter's Display of PC Data
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2005-Feb-19
A method is described to compress the data being transferred from a Personal Computer to the Displaywriter system under the Attach Program. The Displaywriter/Personal Computer Attach Program (DWPL) is a program with routines that run on an IBM Displaywriter (DW) and an IBM Personal Computer (PC). This 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 is accomplished by trapping all BIOS display and keyboard interrupts and DOS function calls. The PC trap routines communicate with corresponding routines on the DW via a 38.4K baud asynchronous communications connection. (The 38.4K baud line speed is the fastest possible compatible line speed between the DW and the PC.