Crt display control system

Abstract

Abstract PURPOSE:To reduce expenses of equipment and improve the operability by controlling plural CRT monitors with one keyboard and one CRT controller. CONSTITUTION:Plural CRT monitors 40 are controlled by one CRT controller 20 connected to a central processing unit 10 and one key input device 30. This CRT controller 20 is provided with a memory part 3 and etc. and has the first and the second system table vectors. The start address of a system table corresponding to a desired CRT monitor 40 designated by a command from the central processing unit 10 is stored in the first vector to make display on the CRT monitor 40 possible. The start address of a pertinent system table is stored in the second vector to make key input to the corresponding CRT monitor possible, and system tables are switched successively to control CRT monitors 40 for display and key input simultaneously or in time division.

Inventors

• 👤 Takeshi Ishii
• 👤 武史 石井

Bibliographic Details