Posted on Jul 23, 2012

The IBM PC debugger plugs into the PC`s math-coprocessor socket.The 8288 bus controller, IC1, regenerates control signals from the processor`s status signals, SO, Sl, and S2. Reset LED Dllights if reset is active and holding the processor. Clock status LED D3 indicates that the processor is receiving a toggling clock signal.

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The address-decode logic detects when the processor is doing a jump-on-reset to the PC"s BIOS ROM"s power-on; self-test then detects a fatal error and halts the processor.

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