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This article describes a method which utilizes a signal already existing in a gate array to generate a new signal that distinguishes between an Intel 80386 processor and an Intel P9 processor in a system.
English (United States)
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Intel 80386 or Intel P9 Detection
This article describes a method which utilizes a signal already existing in a
gate array to generate a new signal that distinguishes between an Intel 80386
processor and an Intel P9 processor in a system.
One of the ways to detect between an 80386 or a P9 is to provide a jumper
and a pull-up resistor. Another way is a design using a gate array. This method
would require an input pin of the gate array. The method of this disclosure uses
a signal already existing in the gate array to generate a new signal that
distinguishes between the 80386 or P9.
The available signal of the lower address pins for an 80386 are "BE(3:0)N"
and for a P9 are "BHEN, A/, A1". One of the four BE signals is used and the
"system reset" signals to generate this new signal.
The logic for this is shown in the drawing. Since during reset the 80386
drives BE(3:0)~ low, it is pulled high on the planar.
After system reset, the state of the / output indicates which processor is
installed. A high indicates a P9 is installed. A low indicates an 80386 is
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