EP 0228136 A3 19900321 - ABSTRACT OPERATION-SIGNALLING FROM A RASTER SCAN VIDEO CONTROLLER TO A DISPLAY MEMORY
Title (en)
ABSTRACT OPERATION-SIGNALLING FROM A RASTER SCAN VIDEO CONTROLLER TO A DISPLAY MEMORY
Publication
Application
Priority
US 81536285 A 19851230
Abstract (en)
[origin: EP0228136A2] A generalized operation-signalling logic for a raster scan video controller whereby the video controller, in accessing the memory of a computer system, can indicate what type of operation is to be performed at each memory address to be accessed. The signalling scheme provides a rich set of functions, logic to generate this signalling and an external PLA-type device which interprets this signalling for a wide variety of memory types.
IPC 1-7
IPC 8 full level
G06F 3/153 (2006.01); G09G 5/00 (2006.01); G09G 5/39 (2006.01); G09G 5/36 (2006.01)
CPC (source: EP)
G09G 5/39 (2013.01); G09G 5/363 (2013.01)
Citation (search report)
- [Y] EP 0121453 A1 19841010 - TEXAS INSTRUMENTS FRANCE [FR], et al
- [A] US 4237543 A 19801202 - NISHIO YOJI, et al
- [A] FR 2338531 A1 19770812 - NUGRAPHICS INC [US]
- [A] IBM TECHNICAL DISCLOSURE BULLETIN, vol. 28, no. 5, October 1985, pages 2240-2243, New York, US; "Circuit for updating bit map-memory of a display adapter"
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0228136 A2 19870708; EP 0228136 A3 19900321; JP S62294284 A 19871221
DOCDB simple family (application)
EP 86202317 A 19861218; JP 31591786 A 19861227