Method for confirming incorporation of a memory into microcomput

Details Method for confirming incorporation of a memory into microcomput Method for confirming incorporation of a memory into microcomput

1982-01-11

1984-12-11

Thomas, James D.

Boots, shoes, and leggings

324 73R, G06F 1300

Patent

active

044882572

ABSTRACT:
A method of confirming that a memory other than a main memory is incorporated into a computer system, e.g., a microcomputer via a bus comprising the steps of predefining at least one bit line of a parallel bus provided between a receptacle for the memory device and a central processing unit (CPU) so as to impose a logical value, i.e., a "0" or a "1", on the data bus line, that value being the opposite of the predetermined logical value of data stored in a predetermined address of the memory device; operating the CPU to attempt to access the predetermined address of the memory device to read the data stored in the predetermined address of the memory device; and checking to see whether the data read in the central processing unit via the data bus line indicates a value or equal to the predefined value, thus determining that the memory device has or has not been incorporated into the computer. In another method, the bit line is connected via a resistor to an output line. The CPU then imposes a first logical value, and then a second logical value opposite to the first logical value on the bit line, while at the same time trying to access the memory device. If the CPU reads in both cases the value imposed on the bit line by the output line, then the CPU determines that there is no memory device incorporated in the computer.

REFERENCES:
patent: 3898631 (1975-08-01), Brown et al.
patent: 4030080 (1977-06-01), Burkett et al.

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