公开(公告)号：MY106706A

公开(公告)日：1995-07-31

申请号：MYPI19901246

申请日：1990-07-25

Applicant: IBM

Inventor： DOYLE STANFILL CRONK ,  EDWARD IRVING WACHTEL ,  MATTHEW STEPHEN PALKA JR ,  ROBERT SACHSENMAIER ,  RICHARD ALAN DAYAN ,  RICHARD BEALKOWSKI ,  KEVIN MARSHALL ZYVOLOSKI ,  JERRY DUANE DIXON ,  SCOTT GERARD KINNEAR ,  ANDREW BOYCE MCNEIL ,  JOHN WILEY BLACKLEDGE JR ,  GEORGE D KOVACH

IPC: G06F13/10 ,  G06F9/445 ,  H04L9/32 ,  G06F12/14 ,  G06F21/22

Abstract: AN APPARATUS AND METHOD FOR PROTECTING BIOS STORED ON A DIRECT ACCESS STORAGE DEVICE INTO A PERSONAL COMPUTER SYSTEM. THE PERSONAL COMPUTER SYSTEM COMPRISES A SYSTEM PROCESSOR, A SYSTEM PLANAR, A RANDOM ACCESS MAIN MEMORY, A READ ONLY MEMORY, A PROTECTION MEANS AND AT LEAST ONE DIRECT ACCESS STORAGE DEVICE.(FIG. 2)

公开(公告)号：MY105624A

公开(公告)日：1994-11-30

申请号：MYPI19900776

申请日：1990-05-15

Applicant: IBM

Inventor： ERNEST NELSON MANDESE ,  RICHARD NEIL MENDELSON ,  DHRUVKUMAR M DESAI ,  DOUGLAS RODERICK CHISHOLM ,  FRANCIS MICHAEL BONEVENTO ,  ANDREW BOYCE MCNEIL ,  SAMMY DAVIS DODDS

IPC: G06F13/12

Abstract: A COMMAND INTERFACE INCLUDES PORTS FOR TRANSFERRING INFORMATION BETWEEN A HOST PROCESSOR AND AT LEAST ONE INTELLIGENT SUBSYSTEM WHICH MAY HAVE ATTACHED DEVICES. A COMMAND INTERFACE PORT RECEIVES EITHER A DIRECT COMMAND OR AN INDIRECT COMMAND FROM THE HOST PROCESSOR, WHICH COMMANDS ARE INDICATIVE OF A TYPE OF OPERATION TO BE PERFORMED BY THE ONE SUBSYSTEM OR AN ATTACHED DEVICE. AN ATTENTION PORT RECEIVES A CODE FROM THE HOSE PROCESSOR WHICH IS INDICATIVE OF WHICH ONE OF THE DIRECT COMMAND OR THE INDIRECT COMMAND IS RECEIVED AT THE COMMAND INTERFACE PORT, AND WHICH IS ALSO INDICATIVE OF WHICH OF THE ONE INTELLIGENT SUBSYSTEM OR A DEVICE IS TO EXECUTE THE COMMAND. A COMMAND BUSY/STATUS PORT RECEIVES A CODE FROM THE ONE INTELLIGENT SUBSYSTEM WHICH IS INDICATIVE OF WHETHER OR NOT THE COMMAND INTERFACE PORT AND THE ATTENTION PORT ARE BUSY, AND WHETHER OR NOT THE ONE INTELLIGENT SUBSYSTEM IS ACCEPTING OR REJECTING COMMANDS. THE HOST PROCESSOR CAN READ THIS PORT WITHOUT ALTERING OR UPDATING THE CODE.( FIG 2 )