Browse Prior Art Database

Read Only Memory

IP.com Disclosure Number: IPCOM000093974D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Dingwall, RP: AUTHOR

Abstract

Mumetal strip 10 is fed under recording head 12. The latter magnetizes strip 10 with the desired bit configuration of stored information. Sufficient flux is provided by head 12 to completely magnetize strip 10 under the write head. After the information is stored in strip 10, the latter can be cut into word lengths and assembled as a memory.

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Read Only Memory

Mumetal strip 10 is fed under recording head 12. The latter magnetizes strip 10 with the desired bit configuration of stored information. Sufficient flux is provided by head 12 to completely magnetize strip 10 under the write head. After the information is stored in strip 10, the latter can be cut into word lengths and assembled as a memory.

Data based on piece 20 of strip 10, shown in drawing B as a bit line, using two-turn word winding 14, are presented via line 16 as the oscilloscope, not shown, traces of drawings C and D. Piece 20 of Mumetal, cut from strip 10, is in a rectangular form of approximate cross-sectional dimension 0.015 inch x 0.015 inch and length 1 inch. The operational parameters of the oscilloscope used are 20 nanosecond per cm. horizontal sweep for drawings C and D, 2 millivolts per cm. vertical deflection for drawings C1 and C2, and 5 millivolts per cm. vertical deflection for drawings D1 and D2. The electrical parameters of the tests for drawings C and D are 800 milliamperes word current on winding 14 and 400 milliamperes bit current on piece 20 via line 18 for writing. The traces of drawings C1 and C2 were taken with a disturb applied DC of 80 milliamperes on line 18. To read, a pulse of 800 milliamperes was applied to winding 14. Readout of the waveform current in piece 20 was observed as an oscilloscope trace via line 11.

The traces of drawings C1 and C2 were positive write and negative write nondestructive read output,...