Device for Processing Magnetic Tape Data Without Idle Times
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
When magnetic tape reels or cartridges are used as storage media, about 1 to 5 msec. pass between the tape read instruction and the receipt of the data of a tape set. Although this time may be filled with other operations or the buffering of another tape set, such an approach is not used for small systems with, for example, only one application and a small work storage, so that unreduced idle times are incurred. With the device described below, the data are available upon request: Two magnetic heads C and D are arranged at a spacing G (gap length). When the magnetic tape is stopped, head C (as shown in the figure) is positioned at the end of tape set R2a, while head D is positioned at the start of tape set R2b. At that time, buffer E contains the data of tape set R2a read in response to the previous instruction.