公开(公告)号：CA1252904A

公开(公告)日：1989-04-18

申请号：CA508410

申请日：1986-05-05

Applicant: IBM

Inventor： AAKRE DAVID E ,  ABRAHAMSON DOUGLAS J ,  BERGLUND NEIL C ,  BETTERMANN VINCENT A ,  HEIM LLOYD S ,  MOE KENNETH A

IPC: G06F13/14 ,  G06F12/06

Abstract: An automatic address assignment system has a plurality of I/0 devices coupled to a bus. Each device contains a unique machine-readable identifier which is used to select the device for address assignment. The identifier is a binary bit string. Each bit position in the bit string is selected by the host in a serial manner with the host specifying which binary value is being solicited. All devices whose identifier digit matches the solicited value respond positively and remain in contention for address assignment. The other devices will not respond and drop out of contention for address assignment until the sequence is restarted from the first bit. After the bit sequence is completed, the address for that device is bused to the device, and the sequence is restarted from the first bit until all devices have been assigned an address.

公开(公告)号：CA1231460A

公开(公告)日：1988-01-12

申请号：CA488367

申请日：1985-08-08

Applicant: IBM

Inventor： AAKRE DAVID E ,  HOFFMAN ROY L ,  MOEN DAVID N ,  SCHMIERER QUENTIN G

IPC: G06F12/00 ,  G06F13/38

Abstract: REAL TIME DATA TRANSFORMATION AND TRANSMISSION OVERLEAP DEVICE A real time data transformation and transmission apparatus transforms data from a first data device and transfers the transformed data to a second data device which need not have a data transfer rate consistent with the first data device. Data from the first data device is divided into blocks and is compressed by a compression device and written into a buffer. A controller controls the buffer to transmit compressed data to the second data device as a function of the data receiving rate of the second data medium provided that the buffer contains a predetermined amount of data. While the buffer is transmitting data, the compressor is compressing further blocks of data which are being written to the buffer such that the predetermined amount of data is stored in the buffer upon completion of the buffer transmitting a block of data. This ensures that complete blocks of data are transmitted to the second data medium at the data receiving rate of the second data medium.