hello,

what have I to do, if I want to write something with my keyboard and the computer should write it in a variable??? I mean like MSDOS, you give an input, press <enter> and the computer saves the input to work with it.

JOACHIM NEU

ehm, i mean assembler isnt best language to learn uch things. It is quite complicated without some library

Isn't it possible???

Can't you do it with IN al,dx??

But what portnumber is keyboard???

JOACHIM NEU

Of course you are not right. In DOS it is very easy to use keyboard input:



You should download some BIOS/DOS interrupt reference, because there are many functions like this.

In Windows the window that have keyboard focus receives messages like WM_CHAR, WM_KEYDOWN and WM_KEYUP and can get the input, but in Windows it is more easy to use controls such as "EDIT" for handling user input.

hello,

I'll do it with function 01 from int 21h. I'm going to code an OS like DOS, INTs went also without DOS, don't they???

JOACHIM NEU

Some INTs come with DOS, while others (BIOS interrupts) are avaible without it. And int 0x21 is a DOS interrupt, so you can't use it without this system.

btw, port number is 60 (i hope, this number is only some flashback from DOS times), but it is little more complicated this way. only lower 7 bits are used for key scan code, uppoer bit is 0 when key is pressed, 1 when released. Before extended (grey) key prefix 0E0h is sent. And some keys (pause, sys request, shifts) are done in more complicated way. However, i think using ports is best way for OS.

i've used



it's better 'cause it's returns extended key-pressed code

hello,

if I write:



there comes an errorwindow. Also with:



What should I do now???

JOACHIM NEU

Well, no-can-do, when you compile as EXE, but it works, when just compiling COM's

What error is it?

mike.dld: are yousure BIOS handles printsreen and SYS request?

hello,
may it come from, that I have an AMD Athlon XP and no Pentium??? Because at the computer of my sister with P3 it works...

JOACHIM NEU