Terminal Having ROS/RAM on Feature Cards
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
This article describes a terminal architecture in which the read-only store (ROS) and/or random-access memory (RAM) required to support a particular feature is mounted on the feature card. The addresses which are assigned to RAM/ROS blocks on a feature card permit those blocks to be addressed through an external address bus as if they were part of the base memory. In effect, physically-distributed memory blocks are logically treated as if all were mounted on a single base card. Referring to Fig. 1, many small terminals include a minimum or base microprocessor card 10. The base microprocessor card may interface with external device features (displays, scanners, etc.) through one or more feature cards 12A, 12B, 12C, etc.