公开(公告)号：DE69332940T2

公开(公告)日：2004-03-11

申请号：DE69332940

申请日：1993-03-25

Applicant: IBM

Inventor： KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK PETER ,  SHARMA VIKRAM

IPC: G06F3/041 ,  G06F3/038 ,  G06F3/033

Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.

公开(公告)号：DE69331204T2

公开(公告)日：2002-08-08

申请号：DE69331204

申请日：1993-03-23

Applicant: IBM

Inventor： KANNAN KRISHNAMURTHI ,  JONES CHRISTOPHER DANE ,  LEE NATHAN JUNSUP ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK PETER ,  SHARMA VIKRAM

IPC: G06F1/26 ,  G06F1/28 ,  G06F1/30 ,  G06F1/32 ,  G06F9/30

公开(公告)号：BR9301358A

公开(公告)日：1993-11-23

申请号：BR9301358

申请日：1993-03-30

Applicant: IBM

Inventor： KANNAN KRISHNAMURTHI ,  JONES CHRISTOPHER D ,  LEE NATHAN J ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK P ,  SHARMA VIKRAM

IPC: G06F1/26 ,  G06F1/28 ,  G06F1/30 ,  G06F1/32 ,  G06F9/30

公开(公告)号：BR9301338A

公开(公告)日：1993-10-19

申请号：BR9301338

申请日：1993-03-29

Applicant: IBM

Inventor： KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK P ,  SHARMA VIKRAM

IPC: G06F3/041 ,  G06F3/038 ,  G06F13/00

Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.