在MS-DOS上调用5接口 [英] Call 5 interface on MS-DOS

问题描述

我有一个MS-DOS的Hello，World程序，它使用int 21h进行系统调用.

I have a Hello, World program for MS-DOS that uses int 21h to make system calls.

mov dx,hello
mov ah,9
int 0x21
mov ah,0
int 0x21

"hello"是字符串'hello，world'，13,10，'$'的地址.

"hello" is the address of the string 'hello, world',13,10,'$'.

该程序有效.

但是，当我用"call 5"替换(第一个)"int 0x21"时，程序使计算机崩溃(即运行PTS-DOS的VirtualBox虚拟机).在DOSbox上，它只是终止并返回到命令提示符.

However, when I replace (the first) "int 0x21" with "call 5", the program crashes the computer (i.e. the VirtualBox virtual machine running PTS-DOS). On DOSbox it simply terminates and returns to the command prompt.

我尝试对地址和电话号码使用不同的寄存器，但总是得到相同的结果.

I tried using different registers for the address and the call number but always got the same result.

现在我想知道...

1. 更高版本的DOS是否不再支持CP/M兼容性调用5接口?
2. PTS-DOS和DOSbox中的DOS不支持呼叫5吗?
3. 我使用的界面错误吗?
4. 我必须首先配置段寄存器吗? (我尝试将所有段寄存器设置为零.)

有什么想法吗?

更新:我接受了答案，因为根据文档它是正确的.它仍然不起作用，但这可能是由于我的DOS版本或其他问题所致.

Update: I accepted the answer because it is correct as per documentation. It still doesn't work but that might be due to my version of DOS or some other problem.

推荐答案

是否有一个DOS版本，您实际上已经在其中看到过CP/M呼叫5"的工作?我从DOS 2.1开始，但是确实为1.1编写了一些代码，而我看到的唯一CP/M兼容性是在FCB中.当然，我并没有明确地寻找它，但是我不记得有人称呼叫5"被任何人支持...

Is there a version of DOS where you've actually seen a CP/M "call 5" work? I started with DOS 2.1, but did write some code for 1.1 and the only CP/M compatibility that I saw was in the FCBs. Of course, I wasn't explicitly looking for it, but I don't recall "call 5" being reported as supported by anybody...

跟进:

最新的PSP定义(在Web上列出，因此YMMV)确实具有受支持的呼叫5"接口.任何真正的DOS兼容环境 都应支持它.

The latest PSP definition (as listed on the web, so YMMV) does indeed have the "call 5" interface as supported. Any true DOS compatible environment should support it.

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