Browse Prior Art Database

Changing a Program Stored in a Read Only Memory Utilizing a Compatible Random Access Memory

IP.com Disclosure Number: IPCOM000080519D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Young, PC: AUTHOR

Abstract

Limited changes or corrections in a program stored in a read-only memory (ROM) are accomplished by partitioning the program into subroutine-like units, each having one entry and one exit. One random-access memory (RAM) instruction is provided to branch and link to each of the program units.

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Changing a Program Stored in a Read Only Memory Utilizing a Compatible Random Access Memory

Limited changes or corrections in a program stored in a read-only memory (ROM) are accomplished by partitioning the program into subroutine-like units, each having one entry and one exit. One random-access memory (RAM) instruction is provided to branch and link to each of the program units.

The RAM instruction for branching to the program unit containing the error or change, branches instead to a RAM stored and corrected version of the original program unit. The size of the program units is a compromise, depending on the likelihood and number of changes in the ROM stored program and the cost of RAM storage.

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