Logical arrangement for controlling use of different system disp

Boots – shoes – and leggings

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

340721, 340717, 364521, G06F 1310, G06F 1516

Patent

active

047574410

ABSTRACT:
A method and system for controlling the display of data in a data processing system that includes a main processor, a memory subsystem, and an Input/Output subsystem which includes an I/O Channel Controller for managing traffic on an I/O bus having an attached co-processor and a plurality of I/O devices including display devices with different reserved I/O address space. The main processor can establish different display modes for displays having different reserved I/O address space, which generally indicates different display types. In one mode, a display is assigned exclusively to the main processor and attempted data transfers by the co-processor to that display are suppressed. The display control means is based on logic circuitry associated with the co-processor for trapping instructions having addresses within the range of those reserved for the display devices. The logic enables normal writes and reads to the video buffer to be suppressed or relocated to the virtual buffer, depending on the mode established by the main processor. A circular queue is established in memory to enable the main processor to selectively individually update the video buffer with the changes that have been made to the virtual buffer.

REFERENCES:
patent: 4208715 (1980-06-01), Kumahara
patent: 4363104 (1982-12-01), Nussmeier
patent: 4396978 (1983-08-01), Hammer
patent: 4454593 (1984-06-01), Fleming et al.
patent: 4466098 (1984-08-01), Southard
patent: 4475237 (1984-10-01), Glasby
patent: 4480314 (1984-10-01), McKelley
patent: 4547849 (1985-10-01), Louie et al.
patent: 4550386 (1985-10-01), Hirosawa et al.
patent: 4562535 (1985-12-01), Vincent et al.
patent: 4571671 (1986-02-01), Burns
patent: 4621319 (1986-11-01), Braun et al.
"Intelligent buffer reconciles fast processors and slow peripherals", Electronics, Sept. 11, 1980, Hillman, pp. 131-135.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Logical arrangement for controlling use of different system disp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Logical arrangement for controlling use of different system disp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Logical arrangement for controlling use of different system disp will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-668308

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.