US4757443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data processing system with unified I/O control and adapted for display of graphics
Assignee: EMC Corp
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Filing: 1984-06-25
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Granted: 1988-07-12
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Expires: 2004-06-25
Abstract
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.
Inventors
- 👤 Mark B. Hecker
- 👤 Robert W. Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:40
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/36; G06; G06F; G06F3/00; G06F3/14; G06F3/153
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A data processing system comprising: a. central processing unit, b. an input/output bus connected to said central processing unit, c. a memory bus connected to said central processing unit, d. a microprocessor controlled video control section connected to said memory bus and adapted to output video signals for a CRT display, and e. an input/output controller connected by a cable to said central processing unit, by a bus to said input/output bus and by a pair of lines to said video control section.
Claim 2
Dependent Claim
83 words
A data processing system comprising: a. central processing unit, b. an input/output bus connected to said central processing unit, c. a memory bus connected to said central processing unit, d. a microprocessor controlled video control section connected to said memory bus and adapted to output video signals for a CRT display, and e. an input/output controller connected by a cable to said central processing unit, by a bus to said input/output bus and by a pair of lines to said video control section.
Claim 3
Dependent Claim
25 words
The data processing system of claim 1 and wherein said microprocessor controlled video control section includes: a. a video memory, and b. a CRT controller.
Claim 4
Dependent Claim
48 words
The data processing system of claim 2 and wherein said video memory is connected to said memory bus, said CRT controller is connected to said memory bus and wherein said pair of lines from said input/output controller are connected to said CRT controller in said video control section.
Claim 5
Dependent Claim
22 words
The data processing system of claim 3 and wherein said controller includes a microprocessor and a storage device for holding a program.
Claim 6
Dependent Claim
143 words
A data processing system comprising: a. a central processing unit, b. an input/output bus connected to said central processing unit, c. a memory bus connected to said central processing unit, d. a microprocessor controlled video control section connected to said memory bus and adapted to output video signals for a CRT display, said microprocessor controlled video control section including a video control section having a video memory and a CRT controller, said video memory being connected to said memory bus, said CRT controller including a microprocessor and a storage device for holding a program, and e. an input/output controller connected to said central processing unit, said input/output bus and to said video control section said input/output controller including a terminal control section, and I/O control section and a processor section, said processor section managing said terminal control section and said I/O control section.
Claim 7
Dependent Claim
143 words
A data processing system comprising: a. a central processing unit, b. an input/output bus connected to said central processing unit, c. a memory bus connected to said central processing unit, d. a microprocessor controlled video control section connected to said memory bus and adapted to output video signals for a CRT display, said microprocessor controlled video control section including a video control section having a video memory and a CRT controller, said video memory being connected to said memory bus, said CRT controller including a microprocessor and a storage device for holding a program, and e. an input/output controller connected to said central processing unit, said input/output bus and to said video control section said input/output controller including a terminal control section, and I/O control section and a processor section, said processor section managing said terminal control section and said I/O control section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |