Insite Peripherals

Aprex Corporation

Xebec Systems, Inc.

Alton B Otis, Jr

Andrew M Rose

Stephen Paul Williams

Roger O Williams

Jimmy D Godwin

Mark E Strysko

James Chiao

Michael L Ivers

Tom Papanek

Darrell Ingram

Peter E Forsman

Digital data are communicated between a portable data-gathering unit and a data-receiving unit without direct electrical connection by transmitting the data over a contactless connection system. In a preferred embodiment, data flow is bidirectional.

Contactless communication system

A dual magnetic head having a first magnetic core for reading and writing very high track density floppy disks and a second magnetic core for reading and writing conventional track density floppy disks. Neither the first nor the second magnetic cores require the trim erase elements associated with prior art magnetic cores for use with floppy disks. When writing on conventional track density floppy disks, separation between data tracks is achieved by erasing a circular region on a first rotation of the floppy disk, erasing a second region, separated from the first region by a small gap, on a second rotation of the floppy disk, and writing data during a third rotation of the floppy disk centered about the small gap. With very high density floppy disks, data is written directly between optical servo tracks on the floppy disk without use of the two erase steps.

Dual magnetic head and method for writing on very high track density and

A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of servo grooves on at least one of said sides of said media that have stitched patterns that will alternate on-and-off at twenty kilohertz in the presence of a constant, unmodulated light source. The diskette is magnetically formatted with reference and data tracks recorded in such a way that extremely accurate position determinations can be made by looking at the analog amplitude of the detected tracks and comparing them at different head positions. The innermost tracks contain redundant copies of a disk mapping table that comprises data for a media type code, a sector size code, a sector interleave code, a total track count, a reassignment area starting address, a data area starting address, a total sector count, an update count, and a reassignment table having at least room for 250 entries of three bytes each.

Very high-density diskette format method and computer-implemented process

Very high-density diskette format method and computer implemented process

A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of optical positioning tracks on at least one of said sides of said media, and a media type code optically embossed on at least one of said sides of said media. The media type code contains information about the physical properties of the particular diskette that will allow a disk drive unit to auto-configure itself to allow optimum data communication and performance.

Disk drive for communicating with removable media that include media

Magnetically indelible media type identification system

A magnetic medium including a physical reference feature for conveying positional information to a magnetic read/write head. The reference feature is made by indelibly marking a pattern on a surface of the medium such as by inscribing the metal oxide coating on the medium surface or by chemical etching or photolithography of the surface. Magnetic data is written on the surface of the medium and when data written on the reference feature is read, a modulated read back signal is observed which indicates the position of the reference feature. The position of the reference feature is used to direct the read/write head to track zero or to some other position on the medium surface. By using a second magnetic read/write head to write data on a second surface of the medium in response to the modulated readback signal, an electronic reference track can be written on the second surface for providing positional information to the second magnetic read/write head.

Magnetic media containing reference feature and methods for referencing

A computer processor is described capable of simultaneously executing a plurality of programs. It accomplishes this by utilizing the next instruction select elements of a processor to select the next instruction for one program, while the data processing elements of the processor are executing an instruction of another program. The processor includes in addition to the next instruction select and data processing elements normally found in a microprocessor, additional program dependent elements for each of the plurality of programs to be processed. That is, it includes for each of the programs to be processed, a program memory allocation, a program address register, and the non-shared data storage registers, such as accumulators.

Growing community of inventors

San Francisco, CA, United States of America

Alton B Otis, Jr