assembly - 快速入门MASM注册问题-DX :AX

Question

我目前正在为x86汇编学习考试。
我没有太多运气来搜索“:”，这太常见了标点符号:/

IDIV - Signed Integer Division

Usage: IDIV src

Modifies flags: (AF,CF,OF,PF,SF,ZF undefined)

Signed binary division of accumulator by source. If source is abyte value, AX is divided by "src" and the quotient is stored inAL and the remainder in AH. If source is a word value, DX:AX isdivided by "src", and the quotient is stored in AL and theremainder in DX.

Taken from "Intel Opcodes and Mnemonics"

DX:AX是什么意思？
非常感谢您的时间:)

Answer 1

这是一对寄存器:DX和AX。

分子本身是一个双字。分子的高位字应存储在DX中，低位字应存储在AX中。