Browse Prior Art Database

Grid and a Memory Array

IP.com Disclosure Number: IPCOM000092189D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Mollier, P: AUTHOR [+2]

Abstract

The grid has an array of two orthogonal sets of lines, covered by a sheet. Contacts are obtained at crossing points by the pressure of a pencil on the sheet. A memory array is coupled to this grid, one core of the memory corresponding to one crosspoint. This arrangement allows to store information handwritten on the grid and to read it out when required. X and Y lines of memory S are connected, on one side, to the corresponding lines of grid M. The other side of X lines of memory is connected to a source +V through resistor R and the other side of Y lines connect to ground. V/R is equal to a half-current necessary for readin or readout operation of a core. In a readin operation, one contact made by pressure on the grid, allows current provided by source V to pass twice through the corresponding core and turns it on.

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Grid and a Memory Array

The grid has an array of two orthogonal sets of lines, covered by a sheet. Contacts are obtained at crossing points by the pressure of a pencil on the sheet. A memory array is coupled to this grid, one core of the memory corresponding to one crosspoint. This arrangement allows to store information handwritten on the grid and to read it out when required. X and Y lines of memory S are connected, on one side, to the corresponding lines of grid M. The other side of X lines of memory is connected to a source +V through resistor R and the other side of Y lines connect to ground. V/R is equal to a half-current necessary for readin or readout operation of a core. In a readin operation, one contact made by pressure on the grid, allows current provided by source V to pass twice through the corresponding core and turns it on. Readout of core array can be performed as required. In the drawing, cores placed on the same X line are read out in parallel. For readout operation, R is connected to a -2V source and the free end of the appropriate X line is connected to the ground. There is one sense line SL for each Y line.

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