公开(公告)号：DE2719253A1

公开(公告)日：1977-11-10

申请号：DE2719253

申请日：1977-04-29

Applicant: IBM

Inventor： BOUKNECHT MAX ABBOTT ,  DAVIS MICHAEL IAN ,  VERGARI LOUIS PETER

IPC: G06F3/00 ,  G06F13/26 ,  G06F13/34 ,  G06F3/04 ,  G06F9/00

Abstract: A peripheral device control unit with improved input-output coupling logic circuits for use in a data processing system including a central computer unit, a memory unit, input-output control logic circuits and a line general coupling having a plurality of lines for interconnecting the units in parallel. (Machine-translation by Google Translate, not legally binding)

公开(公告)号：DE2718019A1

公开(公告)日：1977-11-10

申请号：DE2718019

申请日：1977-04-22

Applicant: IBM

Inventor： BIRNEY RICHARD EUGENE ,  DAVIS MICHAEL IAN ,  GRAYBIEL LYNN ALLAN ,  HOOD ROBERT ALLEN ,  BOCA RATON FLA ,  KAHN SAMUEL ,  OSBORNE WILLIAM STEESE

IPC: G06F9/312 ,  G06F12/06 ,  G06F12/14 ,  G06F13/12 ,  G06F9/18

Abstract: The equate operand spaces (EOS) system provides control over the addressabilities accessed by means of different address keys in an address key register (AKR) in a processor. Executing instructions, and their source and sink type operands may have different address keys in the AKR and therefore different addressibilities. When enabled, the EOS control forces each source operand fetch to occur within the sink operand addressability specified in the AKR, even though the AKR explicity contains a different addressability for source operands. When the EOS feature is disabled, the source operand addressability contained in the AKR is used when fetching source operands. An EOS field in the AKr stores whether the EOS state is enabled or disabled in the processor.

公开(公告)号：DE2717654A1

公开(公告)日：1977-11-10

申请号：DE2717654

申请日：1977-04-21

Applicant: IBM

Inventor： BIRNEY RICHARD EUGENE ,  DAVIS MICHAEL IAN ,  HOOD ROBERT ALLEN ,  MCDERMOTT THOMAS STEPHEN ,  WISE LARRY EDWARD

IPC: G06F12/14 ,  G06F11/00

Abstract: The storage protection control system combines a storage protect key stack with an access key register (AKR) and active access key (AAK) select circuits. Storage key entries in the stack correspond to the physical blocks in the main memory, to provide storage protection for different storage access types within address sub-ranges in the main memory associated with respective access keys. The sub-ranges are blocks of addresses within the full range of addresses of the physical memory. The protect key operation applies to physical addresses, and it obtains system addressing compatibility with an address translation operation using the same access keys as address keys with program logical addresses.