Abstract: A tape recording system for connection to a controller of a floppy disk data recording system for recording data in a stream on a recording tape in the same format that data is recorded on a disk by the disk data recording system. A control processor responds to sensing a beginning-of-stream indicator on the tape (a) by causing an initial gap to be erased in the tape stream adjacent the beginning-of-stream indicator and (b) by next providing an initial beginning-of-segment index pulse to the controller.

Abstract: A data writing and recording system and method and circuitry therefor is disclosed in which peak shift due to pulse crowding of data recorded on a magnetic medium is substantially reduced. The recorded data time pattern is preemphasized to compensate for peak shift such that an optimum magnetic pattern is recorded on the magnetic medium. The preemphasis of recorded peak shift errors is accomplished either by delaying or advancing the time when a particular peak shifted data transition caused by a known encoding data pattern will occur. NRZI type encoded data is coupled to a first serial to parallel shift register and clocked through to a ROM at a frequency corresponding to the data bit cell width. The ROM examines the incoming data, which is also clocked from an intermediate stage in the first shift register to a second serial-to-parallel shift register having a data clock frequency substantially greater than the data clock frequency of the first shift register.