公开(公告)号：CA2046720A1

公开(公告)日：1992-03-01

申请号：CA2046720

申请日：1991-07-10

Applicant: IBM

Inventor： BEARDSLEY BRENT C ,  BELLO KEITH A ,  BENHASE MICHAEL T ,  CLARK FLORENCE J ,  HUNTER PAUL W ,  NORDAHL DONALD M

IPC: G06F13/12 ,  G06F3/06

Abstract: A control unit (12) for DASD operation to transfer data between the device (13) and a buffer (16) and between a channel (11) and a buffer (16). In that manner the channel and device are enabled to transfer data independently of each other. Mechanisms are provided for communication between the channel interface process in the control unit and the device interface process in the control unit. Some of these mechanisms are stored with the record in the buffer and others are stored in control storage. Principle communicating mechanisms include a device record pointer, a channel record pointer, a next operation field, a device state indicator, record control flags, and two buffer pointers.