Browse Prior Art Database

Programmable Read Only Storage

IP.com Disclosure Number: IPCOM000090659D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Kolankowsky, E: AUTHOR

Abstract

One stage of a shift storage register 10 is connected to each of the transfer elements 12 of a read-only storage so that the data stored in the read-only storage can be changed by changing the data in register 10. Transistors 12 are the transfer elements in this storage. Their emitters are all connected to an input column line 14 while their bases are connected through one of the stages of register 10 to output row line 16. Depending on the data stored in the particular stage of the storage register, a signal supplied to a particular column line 14 is transmitted through the transistors 12 to a particular row line 16 when a 1 is stored in the stage of the register coupling the emitter of that transistor 12 to the row line 10.

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Programmable Read Only Storage

One stage of a shift storage register 10 is connected to each of the transfer elements 12 of a read-only storage so that the data stored in the read-only storage can be changed by changing the data in register 10. Transistors 12 are the transfer elements in this storage. Their emitters are all connected to an input column line 14 while their bases are connected through one of the stages of register 10 to output row line 16. Depending on the data stored in the particular stage of the storage register, a signal supplied to a particular column line 14 is transmitted through the transistors 12 to a particular row line 16 when a 1 is stored in the stage of the register coupling the emitter of that transistor 12 to the row line 10. However, when a 0 is stored in the shift register at that stage, the signal is not transmitted since it in effect isolates the emitter of the transistor 12 from the row line. Thus, by changing the data in the shift register, the read-only storage can be programmed.

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