International Business Machines Corporation

John A Lowy

James Arthur Brewer

Roderick S Heard

Harry P Heibein

James D Lewis

John Michael Carmichael

Richard William McCornack

A high speed readback check of data transferred to a cyclic memory before the data source is lost. The cyclic memory is organized into a number of data blocks, each interleaved with or simultaneously accessible with the other data blocks. Thus, a long data record comprises several data blocks and therefore several cycles of the memory. A readback check of data transferred from a source into the memory is accomplished by writing data into one data block in a first cycle, writing data into another block on the second cycle while reading back the first data block and calculating a check character therefrom, continuing through the writing of the entire record, and reading the last block of written data and calculating the check character, and then comparing the calculated check character with a character calculated from the source data to detect any error before the source of the record is lost.

Memory readback check method and apparatus

A charge coupled device (CCD) serial memory has data read from or written into it at a sub-multiple rate of the data rate. The sub-multiple rate is determined by the number of interleaved blocks into which the CCD serial memory is divided.

Method and system for data conversion

An ink jet printing system is provided with synchronization facilities including charging, deflecting, and gutter components and a technique is described for referencing synchronizing pulses to a pedestal voltage level to insure that the ink drop stream clears the gutter during synchronization cycles.

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Longmont, CO, United States of America

John A Lowy