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Improved Display Performance for All-Points-Addressable Text Processing

IP.com Disclosure Number: IPCOM000058063D
Original Publication Date: 1988-Aug-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Fichtner, LG Gibson, JH Hernandez, R Hoffman, VM Rourke, DJ [+details]

Abstract

In versions of the Display Access Method (DAM) before the DisplayWrite 4* (DW4) product (hereafter termed the "current" version of DAM), the display was always operated in alphanumeric mode, in which the display hardware is used to physically place the character patterns on the screen. Since character presentation was handled by hardware, the resulting display performance was very fast. In fact, performance was fast enough that minimizing display I/O was not a concern in the original design of DAM. Instead the original design incorporated simple, straightforward algorithms that were easily implemented, but wasteful with regard to excessive display I/O. Listed below are three examples of display I/O that were basic design points in the current version of DAM. 1.