Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1994-09-14
1995-08-15
Hudspeth, David R.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
326 31, H03K 1716
Patent
active
054423058
ABSTRACT:
A diagnostic apparatus for testing devices such as computer systems, and computer system components such as disk drives or printers. The device comprises a main unit, the main unit having a central processing unit for executing instructions, issuing commands, and receiving data from a first device. The apparatus also has a first peripheral unit coupled to the main unit, the first peripheral unit having ports for interfacing with the first device, the first peripheral unit being interchangeable with a second peripheral unit for interfacing with a second device. The apparatus also comprises a first non-volatile memory unit coupled to the main unit. The first non-volatile memory unit comprising a first set of tests for the first device, the first non-volatile memory unit being interchangeable with a second non-volatile memory unit comprising a second set of tests for a second device. These interchangeable parts are provided so that the user may test various types of hardware. The apparatus further comprises software means for providing termination on a bus and methods for simulating devices on a bus for remote entry into diagnostic programs.
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Apple Computer, Inc., Inside Macintosh, Vol. IV, (1986), pp. IV-238 through IV-295.
Martin Stephen R.
Mooney, Jr. Randall O.
Apple Computer Inc.
Hudspeth David R.
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