SYSTEM FOR REGULATING DATA TRANSFER OPERATIONS

摘要

A magnetic Tape Peripheral Controller (data link processor 20t) is used to manage data transfer between a peripheral tape unit (TCU 5ot) and a main host computer (10). A buffer memory (22) in the peripheral controller (20t) is provided with a status counter unit (34c) to monitor the amount of data-in-transit which momentarily resides in the buffer (22). The status counter unit (34c) provides output signals to the peripheral-controller (20t) to elicit action calling for more data from the peripheral tape unit (50tc) or from the host computer (22) or to indicate that the amount of data in the buffer memory was loaded before the main host computer responded to allow the acceptance of it.