Microcomputer having ROM mass memory for downloading main RAM me

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G06F 300

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active

044596626

ABSTRACT:
A microcomputer system has a microprocessor whose functions are implemented by instructions and data from a directly connected random access memory (RAM). The capacity of the RAM is less than the typical total instruction list for the microprocessor. A read-only mass memory is connected to the RAM and has permanently stored instructions set therein for the microprocessor. A controller controls the flow of instructions from the mass memory to the RAM as required and also controls the flow of instructions and data between the RAM and microprocessor. The instructions from the mass memory are overlayed in the RAM in areas no longer required for instruction execution.

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