Input/Output Cards for Device Attachments
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
A technique is described whereby an input/output (I/O) attachment card is divided into two half-size cards with the hardware and microcode which are the same and which are common to most types of I/O devices being located on one of the half-size cards. This is particularly useful in the attachment of a variety of I/O devices to a computer I/O channel. Of essence is the incorporation on a single half-size card of the common logic and microcode that are used in nearly all I/O applications, such common logic including: 1. the interface logic for the computer I/O channel; 2. a microprocessor; 3. hardware timers; 4. direct-memory access controls; 5. random-access memory; and 6. read-only memory for micro-supervisor storage.