如何通过BIOS中断以实模式处理键盘? [英] How to handle keyboard in real mode through BIOS interrupts?

问题描述

我必须为可以在其上运行计算器的操作系统编写代码，就像台式机一样.为此，我正在阅读 brokenthorn操作开发系列，我已经完成了

I have to code for a operating system on which I can run a calculater.It is like a desktop calculater. For this I am reading the brokenthorn operating development series I have completed the second stage of bootloader The bootloader is in real mode. After this the author is explaining the protected mode. I don't want to use the protected mode. I don't have time for that. So I want to write the calculater in real mode by using bios interrupts. Is it possible? I think it can be written on the second stage of the bootloader(I am not sure.) Means I don't have to use a kernel(I am not sure). I don't know how to use BIOS interrupts to handle the keyboard. Can anybody provide me a link which will help me in this? And If anything wrong in whatevet I assumed above is wrong, please correct me.Thanks in advance.

推荐答案

如果您想使用高级BIOS键盘服务，而不是自己处理键盘中断，那么您想要的就是INT 16h.

If you want to use high-level BIOS keyboard services, rather than handling the keyboard interrupts yourself, then INT 16h is what you want.

INT 16h和AH=00h或10h将阻止等待按键(在AL中返回ASCII结果)；如果要避免阻塞，请使用AH=01h或11h首先查询是否有按键可用(如果有按键可用，立即按ZF返回，否则设置).参见例如此处，或

INT 16h with AH=00h or 10h will block waiting for a keypress (returns ASCII result in AL); use AH=01h or 11h to query whether a keypress is available first if you want to avoid blocking (returns immediately with ZF clear if a key is available, or set if not). See e.g. here, or here (or Google "INT 16h" for more).

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