公开(公告)号：CA1136301A

公开(公告)日：1982-11-23

申请号：CA352842

申请日：1980-05-27

Applicant: IBM

Inventor： BOYD CLAY E ,  JONES JOHN C ,  MUMOLA JOANNE L

IPC: G09F9/00 ,  G06F1/16 ,  G09G1/00 ,  G09G1/04 ,  G09G1/16 ,  G09G5/32 ,  H04N1/113 ,  H04N5/64

Abstract: ROTATABLE RASTER SCAN DISPLAY Apparatus for rotating a cathode ray tube (CRT) which is operated as a graphic display through 90 degrees such that different size pages of data may be displayed while minimizing the control circuitry required. The display deflection yoke is fixedly attached to a support frame for the display. The CRT is rotatably mounted within the yoke and held by an annular thrust bearing which allows the CRT to be rotated 90 degrees. A switch is actuated by the rotation of the CRT to select between sets of control resistors to control the raster scan of the CRT in accordance with its orientation. AT9-78-033

公开(公告)号：CA1166368A

公开(公告)日：1984-04-24

申请号：CA374653

申请日：1981-04-03

Applicant: IBM

Inventor： DEMKE KENT R ,  DWIRE JEROLD D ,  KO MICHAEL A ,  MUMOLA JOANNE L

IPC: G09G3/00 ,  G06T11/20 ,  G09G5/26 ,  G09G5/28 ,  G06F3/153 ,  G09G1/00

Abstract: Multiple Height Proportioned Character Generation A system and method for generating properly proportioned alphanumeric characters and symbols in two vertical heights with a single character generator and a minimum of associated circuitry. The bits of video data stored in the character generator are stored such that the vertical segments of diagonal portions of the characters and symbols include no more than two bits per vertical segment of the diagonal portion. The video data bits representative of the pels of circular portions of the symbols are stored in an arrangement to generate a horizontally elongated elliptical shape when the character or symbol is displayed in the shorter of the two heights. Whenever possible, the diagonal portions of characters include no more than two diagonally disposed pels in the single high character size. For representation of a single dot portion of one of the characters or symbols, a pair of video data bits is stored to generate a pair of horizontally disposed pels on the display when the character or symbol is displayed in the shorter of the two vertical heights. Translation logic is described to efficiently provide for two sizes of characters with a minimum of additional hardware and with no additional character generator memory beyond that required for the smallest characters or symbols. AT9-79-035