| 摘要 |
PURPOSE:To easily debug an operating system itself, other various drivers, interruption processing, etc., by building a program for an initializing input/ output port and a preset debugging program in an initial program loader ROM. CONSTITUTION:The program which initializes the whole circuit and input/output port 4, a program which reads a program out of an external storage device and loads it in a main memory 2, and the program for debugging are written in the initial program loader ROM(IPL.ROM) 3. When the system is started or reset, the programs in the IPL.ROM 3 are started, so the input/output port is initialized and the program for debugging can be started by supplying an instruction to a central processor 1 through external operation. Consequently, all programs which are loaded in the memory can be debugged including the operating system.
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