Communication Protocol Among Data-Entry Terminals In A Cluster
Original Publication Date: 1980-Feb-01
Included in the Prior Art Database: 2005-Feb-13
Data-entry terminals 11, 12, 13 (Fig. 1) each have keyboards, displays, printers and other I/O devices controlled by separate internal programmed processors. Primary terminal 11 also has a disk 14 or other storage medium containing both programs for use by all the terminals and data entered at all the terminals. Satellite terminals, such as 12, do not contain their own drives. Back-up terminal 13 contains drive 15 in case of a failure in terminal 11. This cluster 10 of terminals is interconnected by a serial communications line 16.