Boots – shoes – and leggings
Patent
1986-06-04
1989-05-30
Clark, David L.
Boots, shoes, and leggings
380 4, 360 15, G06F 500
Patent
active
048356824
ABSTRACT:
A computer system for preventing copying or duplication of a program which has a CPU, a ROM, a RAM, an FDD unit, a loader program executed by the CPU for loading the program from the FDD unit to the memory, an address selector switch, and an FM/MFM modulating circuit. The CPU reads the program from the FDD unit to the RAM under the control of a control program stored in the ROM, the program being stored in the FDD unit in the MFM mode which does not allow readout of the program by the loader program. The readout program is modified by the FM/MFM modulating circuit in accordance with a machine number unique to the machine and read from the address selector switch. The modified program is written in the FDD unit by the FM/MFM modulating circuit.
REFERENCES:
patent: 4157454 (1979-06-01), Becker
Guruge A., "Preventing Unauthorized Access to Diskette-Loaded Microcode," IBM Technical Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, pp. 836-837.
American Federation of Information Processing Soc. U.S.A.-Japan Compt. Conference Proceedings Tokyo, Aug. 26-28, 1975.
IBM--vol. 14, No. 11, Apr. 1972, "Computer Program Protection".
Kurachi Tadashi
Ueda Shoji
Clark David L.
Tokyo Shibaura Denki Kabushiki Kaisha
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