公开(公告)号：AU5743280A

公开(公告)日：1980-11-06

申请号：AU5743280

申请日：1980-04-14

Applicant: IBM

Inventor： MURPHY A S

IPC: G09G5/38 ,  G09G5/20 ,  G09G5/24 ,  G09G5/30 ,  G09G5/36 ,  G09G1/00 ,  G09G3/20

Abstract: A cell-organized graphic display apparatus is described in ' which a set of canonical or standard cells is stored in a character generator (17). A data processor (not shown) loads character codes into a character buffer (14) and attribute bits into an attribute buffer (16). Lines to be displayed are computed on a cell-by-cell basis by the processor using two canonical cells and the computed character codes are stored in the character buffer (14): attribute bits representing displacements of the required canonical cells are loaded into the attribute buffer (16). During accessing of the character generator (17), an adder (20) shifts the bit patterns in accordance with the attribute bits. Optionally a second character buffer (40), a second character generator (39) and a logic mixer (37) are used to allow logical combining of cell images in accordance with attribute bits.

公开(公告)号：BE762664A

公开(公告)日：1971-07-16

申请号：BE762664

申请日：1971-02-08

Applicant: IBM

Inventor： ARULPRAGASAM J A ,  MINSHULL J F ,  MURPHY A S

IPC: G06F13/12 ,  G11C15/04 ,  G06F

Abstract: A multiplex input/output (I/O) channel in which channel functions are carried out by associative stores. Three associative stores are used, a control store, an address store and a data store. The data store acts as a data buffer store and also handles most of the interchange of control signals between the channel and the I/O control units. Tag-in I/O signals are used directly as keys in table look-up on interface response tables and initiate the appropriate response from the channel. The address store assemblies the main store address and is also responsible for some of the tag-out I/O signals. Subchannels are allotted only when they are needed. There are a limited number of subchannel areas and these are marked when they are allotted to control units. An extra marker identifies the subchannel currently in use. Any control unit can be allotted to any subchannel.