Data Transfer Interlock Mechanism Between the IBM Personal Computer and a Microprocessor-Controlled Attachment
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
This article describes a technique which defines a communication architecture between the IBM Personal Computer (PC) and an attachment feature which uses multi-byte strings to define commands to the attachment and responses to the PC. In transferring data from the PC to a microprocessor-controlled attachment feature, three requirements need to be met. 1. To transfer a large amount of data to and from the attachment while using the least amount of I/O addresses. 2. To guarantee that data will not be overwritten by one attachment before it is read by the other. 3. To insure that information can both be sent to the PC and received from the PC concurrently. Fig.