如果8255A的端口A工作在双向方式,这时可作他用的I/O线还有() ["10条","11条","12条","13条"]
某微机系统中8253通道0的端口地址为200H,则控制寄存器的地址为() ["201H","202H","203H","204H"]
文本按是否可执行划分,可分为() ["静态文本","超文本","动态文本","简单文本"]
8位二进制补码整数的最小值是() ["-126D","-127D","-128D","-129D"]
设计算机中参与运算的两数X和Y均为补码形式,其中X=87H,Y=B4H,当计算机执行X-Y指令时,最终在硬件加法器中进行的操作为() ["F9H+B4H","79H+B4H","87H+CCH","87H+4CH"]
请简答在比洞赛和比杆赛中局外者各自的概念?