公开(公告)号：ZA9108300B

公开(公告)日：1992-07-29

申请号：ZA9108300

申请日：1991-10-17

Applicant: IBM

Inventor： BEATTIE IRENE ,  IRENE BEATTIE ,  DESAI NARENDRA ,  NARENDRA DESAI ,  VANOVER MICHAEL ,  MICHAEL VANOVER ,  VOLTIN JOHN ,  JOHN VOLTIN

IPC: G06F3/14 ,  G06T11/00 ,  G09G5/06 ,  G09G5/14 ,  G06F ,  G06G ,  G09G ,  H03M

CPC classification number: G09G5/14 ,  G09G5/06

公开(公告)号：ZA918300B

公开(公告)日：1992-07-29

申请号：ZA918300

申请日：1991-10-17

Applicant: IBM

Inventor： BEATTIE IRENE ,  IRENE BEATTIE ,  DESAI NARENDRA ,  NARENDRA DESAI ,  VANOVER MICHAEL ,  MICHAEL VANOVER ,  VOLTIN JOHN ,  JOHN VOLTIN

IPC: G06T11/00 ,  G09G5/06 ,  G09G5/14 ,  G06F3/14 ,  G06F ,  G06G ,  G09G ,  H03M

Abstract: A video display system selectively controls by window the number of overlay planes, the number of overlay palettes, and the overlay/underlay plane masks in a graphics display. A logic/multiplex control 13, 11 translates overlay and underlay data patterns from a multiple plane VRAM 12, referenced to the graphics system frame buffer 9, into window specific patterns. The window related translation is conveyed to conventional RAMDACs 11 for raster scan synchronized digital-to-analog conversion. The translation as provided by the controller is responsive to data selectively and dynamicaliy written into a random access memory 14, thus providing translation of overlay/underlay data into window distinct and selective overlay/underlay palette functions.