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EP0102750A2
Expired / Lapsed
EP
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Character font display systems
Assignee: Babcock and Wilcox Co
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Filing: 1983-07-28
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Granted: —
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Expires: 2003-07-28
Abstract
Abstract A system for producing a cathode ray tube display comprising programmable character fonts utilizes a random access memory (18) in addition to a read only memory (16) for the storage of character fonts. The random access memory (18) is programmable via a microprocessor (12) for the entry of the desired character fonts therein. The microprocessor (12) can access either the read only memory (16) or the random access memory (18), via a display memory (20), for the retrieval of the proper character font for display on a cathode ray tube (38).
Inventors
- 👤 Marion A.Iv Keyes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:47
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/22; G09G5/222; G09G5/225
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A system for providing character fonts to a display device, the system (10) comprising first memory means (16) having character fonts contained therein and being characterised by microprocessing means (12) having a program memory (14) associated therewith, second memory means (18) having character fonts contained therein, and means for selecting between the first memory means and the second memory means to cause the appropriate character fonts contained therein to be transferred to the display device (38).
Claim 2
Independent Claim
76 words
A system for providing character fonts to a display device, the system (10) comprising first memory means (16) having character fonts contained therein and being characterised by microprocessing means (12) having a program memory (14) associated therewith, second memory means (18) having character fonts contained therein, and means for selecting between the first memory means and the second memory means to cause the appropriate character fonts contained therein to be transferred to the display device (38).
Claim 3
Dependent Claim
20 words
A system according to claim 1, wherein the operation of the selecting means is controlled by the program memory (14).
Claim 4
Dependent Claim
72 words
A system according to claim 1, including a display memory (20) containing address information as to the character fonts respectively stored in the first memory means (16) and the second memory means (18), the display memory (20) being accessible by the microprocessing means (12) and being operable to select between the first memory means (16) and the second memory means (18) in response to an address supplied by the program memory (14).
Claim 5
Dependent Claim
37 words
A system according to claim 1, claim 2 or claim 3, wherein the second memory means (18) is accessible by the microprocessing means (12) to permit the entry of and modification of the character fonts contained therein.
Claim 6
Independent Claim
33 words
A system according to any one of the preceding claims, including accessing means (24, 26) for accessing the microprocessing means (12) to permit the entry of and modification of information within the system.
Claim 7
Dependent Claim
16 words
A system according to claim 5, wherein the accessing means comprises a communication input means (26).
Claim 8
Independent Claim
22 words
A system according to any one of the preceding claims, wherein the first memory means (16) is a read only memory means.
Claim 9
Independent Claim
22 words
A system according to any one of the preceding claims, wherein the second memory means (18) is a random access memory means.
References Cited (Backward Citations)
No citation records indexed.
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