All of these repeat prefixes cause the associated instruction to be repeated until the count in register is decremented to 0.
2
计数寄存器(Count Register, CTR)是64位寄存器。
The Count register (CTR) is a 64-bit register.
3
当主控门打开时,经过转换的输入信号脉冲通过它进入计数寄存器,并在此统计,然后通过显示电路输出。
While the main gate is open, the conditioned input signal pulses are passed through to the counting register, where they are tallied and then scaled for output by the display circuitry.