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发明授权
US4875156A Computer having a protection device to selectively block incorrect control signals 失效
计算机具有保护装置以选择性地阻止不正确的控制信号

Computer having a protection device to selectively block incorrect control signals
摘要：
In a computer having a program including a first type of instruction and a second type of instruction, a program memory has a first area for storing the first type of instruction and a second area for storing the second type of instruction. An address code is supplied from a program counter to the program memory, which thereby produces an instruction code stored at the addressed memory location. A control unit is responsive to the instruction code from the program memory for producing a control signal for controlling the operation of the computer. A protection circuit is provided for preventing execution of the first type of instruction when the address code output from the program counter does not designate any memory location in the first area.
摘要（中）：

在具有包括第一类型指令和第二类型指令的程序的计算机中，程序存储器具有用于存储第一类型指令的第一区域和用于存储第二类型指令的第二区域。 从程序计数器向程序存储器提供地址代码，从而产生存储在所寻址的存储器位置的指令代码。 控制单元响应于来自程序存储器的指令代码，用于产生用于控制计算机的操作的控制信号。 当从程序计数器输出的地址代码未指定第一区域中的任何存储器位置时，提供保护电路以防止执行第一类型的指令。

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