公开(公告)号：CA1297214C

公开(公告)日：1992-03-10

申请号：CA556027

申请日：1988-01-07

Applicant: IBM

Inventor： GUPTA SATISH ,  LUMELSKY LEON ,  MANSFIELD ROBERT L ,  ROMERO HECTOR G JR ,  SEGRE MARC ,  SPENCER ALEXANDER K ,  ST CLAIR JOE C ,  WAGONER JAMES D

IPC: G06F3/153 ,  G06T11/20 ,  G09G5/393 ,  G09G5/00

Abstract: As the speed and capacity of graphics workstations and personal computers including graphics adapters increases, the demand for high resolution intelligent display adapters also increases. Large graphic applications, formerly limited to large main frame computers with dedicated graphics display terminals may use this increased capability in the workstations to migrate applications to stand alone systems. The present invention relates to a graphics display adapter which can be used either in such a high capacity stand alone graphics workstation or in conjunction with a large main frame host computer. KI986-029

公开(公告)号：CA1236599A

公开(公告)日：1988-05-10

申请号：CA495677

申请日：1985-11-19

Applicant: IBM

Inventor： ROMERO HECTOR G JR ,  ST CLAIR JOE C ,  WAGONER JAMES D

IPC: G06F3/153 ,  G06F12/00 ,  G06F12/02 ,  G09G1/16 ,  G09G5/00 ,  G09G5/393 ,  G09G5/395 ,  G09G1/00

Abstract: DUAL PURPOSE SCREEN/MEMORY REFRESH COUNTER A counter is used to concurrently refresh a video display and a memory associated with such video display. Address bits are output from the counter to the sync decode logic used to refresh the display as well as to multiplexing means connected to the associated memory. The multiplexing means has three pairs of inputs. The first pair of inputs comprises refresh addresses from the counter for refreshing the memory array. The second pair of inputs to the multiplexing means comprises memory update addresses for writing new information into the memory. A third pair of inputs to the multiplexing means performs two functions. The first function enables the multiplexing means to output either the update addresses or the refresh addresses depending on the state of such inputs. The second function of the third pair of inputs is to identify the output of said multiplexing means as either a row address or a column address to the associated memory. The apparatus and technique disclosed herein is especially pertinent when a "nibble mode" dynamic RAM is used as the memory.

公开(公告)号：BR8800248A

公开(公告)日：1988-09-13

申请号：BR8800248

申请日：1988-01-25

Applicant: IBM

Inventor： GUPTA SATISH ,  LUMELSKY LEON ,  MASFIELD ROBERT L ,  ROMERO HECTOR G JR ,  SEGRE MARC ,  SPENCER ALEXANDER K ,  CLAIR JOE C ST ,  WAGONER JAMES DONALD

IPC: G06F3/153 ,  G06T11/20 ,  G09G5/393 ,  G06F15/62 ,  G06F3/14

Abstract: As the speed and capacity of graphics workstations and personal computers including graphics adapters increases, a display adapter which can be used either in such a high capacity stand alone graphics workstation or in conjunction with a large main frame host computer includes a first processor for managing adapter resources and controlling coordinate transformations; a system storage for storing instructions and data representing information to be displayed; a first-in, first-out input buffer for allowing asynchronous and overlapped communication between the graphics system and a host computer;a second processor for drawing vectors and manipulating areas to be displayed on the monitor;a frame buffer connected to the second processor for storing a bit map of data to be displayed; a colour palette connected to outputs of the frame buffer for providing appropriate colour signals to the monitor; and a hardware cursor circuit for controlling display of a cursor on the monitor.