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Pseudo Buffer Allocation for Format Length Control

IP.com Disclosure Number: IPCOM000064761D
Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Dodt, WC Rehage, TA Robinson, FL [+details]

Abstract

In new half-inch tape technology, the sequence of write tape mark (WTM) and erase record gap (ERG) operations in tape operation control are made similar in that they use the byte count differential of the beginning buffer data pointer and the ending buffer data pointer to determine the length of the format pattern. The command sequence from the microprogram is also similar for the two operations. The write data flow has no controls for the amount or length of data to be written, either customer data or in this case the WTM or ERG patterns. The commands are executed in the following manner: The drive is issued a write command. The beginning buffer data pointer is set to an arbitrary address within the buffer segment assigned to the addressed drive (ADDR).