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公开(公告)号：DE68920580D1
公开(公告)日：1995-02-23
申请号：DE68920580
申请日：1989-10-12
Applicant: IBM
Inventor： HAIGH DAVID CHRISTOPHER , FARR ROBERT WILLIAM ERIC
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公开(公告)号：DE3484448D1
公开(公告)日：1991-05-23
申请号：DE3484448
申请日：1984-02-20
Applicant: IBM
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公开(公告)号：DE68920148D1
公开(公告)日：1995-02-02
申请号：DE68920148
申请日：1989-10-12
Applicant: IBM
Abstract: A display system has cursor definition memory for storing data defining a graphics cursor, a cache for the temporary storage of a portion of the graphics cursor for display on a display device, the cache being such that its data rate is sufficient to support the display of the graphics cursor, and control logic for updating the cache from the cursor definition memory at a slower data rate. The cache need only be large enough to store a portion of the cursor at any one time as the graphics cursor is only displayed for a fraction, for example one-tenth, of a scan line and the cache can be updated during the portion of the scan time when the cursor is not displayed. Through the use of a small cache operable at the required data rate, inexpensive memory which does not support the required data rate can be used for the cursor definition memory.
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公开(公告)号：CA2021831C
公开(公告)日：1995-12-05
申请号：CA2021831
申请日：1990-07-24
Applicant: IBM
Inventor： HARRISON ROY BERNARD , WOOD ROGER TIMOTHY , HAIGH DAVID CHRISTOPHER
Abstract: A display system has, in addition to a display memory for the main storage of display information for a character mode, a separate cache for the temporary storage of the definitions of one or more fonts currently required for display and control logic for updating the font cache from the display memory. This enables the efficient support of a character mode on a display system, particularly where the display memory of that system is implemented with dual-ported memory technology. Compatibility with existing display standards is achieved.
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Patent Agency Ranking
公开(公告)号：DE68920147D1
公开(公告)日：1995-02-02
申请号：DE68920147
申请日：1989-10-12
Applicant: IBM
Inventor： HARRISON ROY BERNARD , WOOD ROGER TIMOTHY , HAIGH DAVID CHRISTOPHER
Abstract: A display system has, in addition to a display memory for the main storage of display information for a character mode, a separate cache for the temporary storage of the definitions of one or more fonts currently required for display and control logic for updating the font cache from the display memory. This enables the efficient support of a character mode on a display system, particularly where the display memory of that system is implemented with dual-ported memory technology. Compatibility with existing display standards is achieved.
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公开(公告)号：CA2021828C
公开(公告)日：1995-10-10
申请号：CA2021828
申请日：1990-07-24
Applicant: IBM
Inventor： HAIGH DAVID CHRISTOPHER , HARRISON ROY BERNARD , BONNOR HELEN ROSALIND
Abstract: A display system has cursor definition memory for storing data defining a graphics cursor, a cache for the temporary storage of a portion of the graphics cursor for display on a display device, the cache being such that its data rate is sufficient to support the display of the graphics cursor, and control logic for updating the cache from the cursor definition memory at a slower data rate. The cache need only be large enough to store a portion of the cursor at any one time as the graphics cursor is only displayed for a fraction, for example one-tenth, of a scan line and the cache can be updated during the portion of the scan time when the cursor is not displayed. Through the use of a small cache operable at the required data rate, inexpensive memory which does not support the required data rate can be used for the cursor definition memory.
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公开(公告)号：DE68920580T2
公开(公告)日：1995-07-06
申请号：DE68920580
申请日：1989-10-12
Applicant: IBM
Inventor： HAIGH DAVID CHRISTOPHER , FARR ROBERT WILLIAM ERIC
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公开(公告)号：DE68920148T2
公开(公告)日：1995-06-29
申请号：DE68920148
申请日：1989-10-12
Applicant: IBM
Abstract: A display system has cursor definition memory for storing data defining a graphics cursor, a cache for the temporary storage of a portion of the graphics cursor for display on a display device, the cache being such that its data rate is sufficient to support the display of the graphics cursor, and control logic for updating the cache from the cursor definition memory at a slower data rate. The cache need only be large enough to store a portion of the cursor at any one time as the graphics cursor is only displayed for a fraction, for example one-tenth, of a scan line and the cache can be updated during the portion of the scan time when the cursor is not displayed. Through the use of a small cache operable at the required data rate, inexpensive memory which does not support the required data rate can be used for the cursor definition memory.
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公开(公告)号：DE68920147T2
公开(公告)日：1995-06-29
申请号：DE68920147
申请日：1989-10-12
Applicant: IBM
Inventor： HARRISON ROY BERNARD , WOOD ROGER TIMOTHY , HAIGH DAVID CHRISTOPHER
Abstract: A display system has, in addition to a display memory for the main storage of display information for a character mode, a separate cache for the temporary storage of the definitions of one or more fonts currently required for display and control logic for updating the font cache from the display memory. This enables the efficient support of a character mode on a display system, particularly where the display memory of that system is implemented with dual-ported memory technology. Compatibility with existing display standards is achieved.
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