John L Couleur

41737830, Nov 6, 1979

May 2, 1977

5/792964

John F. Couleur - Scottsdale AZ
Robert E. Scriver - Phoenix AZ

Honeywell Information Systems, Inc. - Waltham MA

G06F 300
G06F 920

364200

In a data processing system employing paging and segmentation for storing information in memory, the input-output unit is provided with addressing capability for addressing and accessing memory without the intervention of the central processing unit to convert virtual addresses to absolute addresses. Paged tables are set up in memory by the central processing unit prior to input-output operations containing page table words, and a page table is assigned to each peripheral. A peripheral control word assigned to each peripheral includes a pointer to the start of the peripheral's page table whereby the peripheral through the I/O unit and without central processing intervention can locate its assigned page table, and page table words therein are used independent of any central processor virtual to absolute address conversion to access paged memory locations.

43001920, Nov 10, 1981

Nov 14, 1978

5/960574

John F. Couleur - Scottsdale AZ
Robert F. Montee - Phoenix AZ

Honeywell Information Systems Inc.

G06F 946
G06F 1300

364200

Partitioning, paging, and segmentation techniques are employed with virtual memory to provide more secure and efficient storage and transfer of information. The virtual memory is divided into a plurality of partitions with real memory storage provided by paging the plurality of partitions. User programs are segmented into logical units and stored in assigned partitions thereby isolating user programs and data. Unsegmented programs may be run by storage in a partition with direct addressing. Segment descriptors including partition, base, and bound are utilized in accessing memory. User domains are expandable by temporarily passing descriptor parameters from one routine to another with access flags limiting access thereto. By shrinking passed descriptors the receiving routine can be restricted to only a portion of the information defined by the descriptor.