IEEE Computer Volume 11 Number 1 -- NEW PRODUCTS
Original Publication Date: 1978-Jan-01
Included in the Prior Art Database: 2005-Nov-10
Software Patent Institute
D. A. Michalopoulos: AUTHOR [+3]
THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.
This record contains textual material that is copyright ©; 1978 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Contact the IEEE Computer Society http://www.computer.org/ (714-821-8380) for copies of the complete work that was the source of this textual material and for all use beyond that as a record from the SPI Database.
Prof. D. A. Michalopoulos
California State University, Fullerton edited by
Prof. D. A. Michalopoulos California State University, Fullerton
Data Systems offers first magnetic bubble mass storage system
Data Systems Design has introduced the first mass storage system using magnetic bubble technology.
The new DSD 640 is a DEC-compatible, nonvolatile memory system designed to replace floppy disks in harsh environments. It has an average access time of 4 msec compared to an average access time of 313 msec for a floppy disk (including latency). Maximum access time of the DSD 640 is 7.2 msec.
According to Data Systems, the use of magnetic bubble technology brings several advantages to applications currently served by floppy disks. Because the solid state device has no moving parts, mean time between repairs is estimated at 10,000 hours. The nonvolatile memory retains information indefinitely in case of power loss, and its rugged nature makes it well-suited for many applications where floppy disks are difficult to use and maintain.
Boards, power supply, and chassis of the modular DSD 640 can be pulled for testing and replacement; mean repair time is 30 minutes. A self-testing microcode guards against undetected errors, while multiple indicator diagnostic lights permit troubleshooting to the board level. Troubleshooting to the component level is simplified by built-in signature analysis.
The DSD 640 is a direct replacement for existing floppy disks in DEC computer systems. It comes complete with interface board, cables, schematics, documentation package, and diagnostics. According to DSD, the user simply removes the floppy disk unit and plugs in the 640.
The system has an expandable capacity with up to 519K bytes available in single card increments of 82K. It also features a microprogrammed bipolar bit slice controller which supervises all memory operations and data transfers to the computer.
Reader Service Number 6
(Image Omitted: Continental Specialties' 16-channel clip-on logic monitors indicate the status of an entire 14- or 16- pin DIP at once. Model LM-1 (1eft) tests DTL, TTL, HTL, and CMOS logic families. It automatically seeks out the highest positive and lowest negative voltage levels and draws its power from the IC under test. Comparators at each pin (100,000 Ohm input impedance) drive individually labeled LED's "on" for a high and "off" for a low logic level. Model LM-2 (right) includes a fully isolated line~operated power supply. Clip leads ride the circuit's supply rails; logic family...