@签到汇编程序？(@ sign in assembler?)

@签到汇编程序？(@ sign in assembler?)

我正在为一个信息系统课做一个任务，教授决定使用psuedo-assembler。 他用了

@

在

SUB @106, -2(104), 110

这个符号是什么意思？

I am doing an assignment for an information systems class and the professor decided to use psuedo-assembler. He used the

@

in

SUB @106, -2(104), 110

What does that symbol mean?

最满意答案

在DEC的汇编语言（PDP-11，VAX）中， @表示间接寻址模式 ，即额外的间接级别。

在您的情况下， @106表示操作数的地址取自地址106 。

In DEC's assembly languages (PDP-11, VAX) @ means indirect addressing mode, i.e. an extra level of indirection.

In your case, @106 means that the address of the operand is taken from the address 106.