Data processing system with unified I/O control and adapted for display of graphics
US4757443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1984 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Jun 25, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/153
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data processing system which includes a central processing unit (CPU) to which is connected an I/O bus and a memory bus is disclosed. The data processing system further includes an I/O controller and a video control section. The I/O controller includes a terminal control section which is connected to the CPU through an RS232 Cable, an I/O control section which is connected to the I/O bus over a single line and a single processor for managing both the terminal control section and the I/O control section. The I/O control section includes a plurality of interface and control subsystems each for use with a separate peripheral device and an I/O bus interface and control subsystem. The terminal control section includes a video control section interface through which data is sent directly to the video control section over a separate line, and a keyboard interface for interfacing the terminal control section to a keyboard. The video control section includes a video memory and a microprocessor which are both connected to the memory bus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.