assemly language

Comments

• frizzz

  March 2005

  : I am haveing some trouble with a code
  : what i want to do is input a charater from the keyboard and print it on the next line with a "?" as the input so the user knows a input is required
  :
  : Look at my homepage and find a lot of examples, how to deal with keyboard and output on screen in the downloadable assembler OS:
  http://www.rcfriz.de
  
• mr_orche

  June 2005

  : I am haveing some trouble with a code
  : what i want to do is input a charater from the keyboard and print it on the next line with a "?" as the input so the user knows a input is required
  
  ;example for inputting user name:
  org 100h
  jmp begin
  inputmsg db 'Enter your name ?',0 ;asciiz string
  
  begin:
  mov dx, inputmsg ;this will print on the screen
  mov ah, 9 ;"Enter your name? _"
  int 21h
  ;type your keyboard handler here
  
  
• frizzz

  June 2005

  
  : int 21h
  : ;type your keyboard handler here
  :
  I'm sorry!- at least 15 years passed, since I worked with int 21h, and I do not have any information about it (maybe You'll find it using google-search).
  But if You want to know, how to read directly the input from keyboard, reading at the ports of the keyboard-controller, You could find a well commented example in the source of my OS "FDOS1", which You can download from my homepage:
  www.rcfriz.de
  My OS works in protected mode, but interfacing the keybord-controller is the same in real mode (You need to use real-mode-code of course!). You will need Your own interrupt-handler for int #1 in the interrupt-controller (You need to take care for the base- number of this controller!) and then You need to write Your own keyselection including a read-access at the keybord-controller.
  If You want to use Your code under MSDOS You will need some more code after reading the keybord-controller. You need to tell the interrupt-controller the end of interrupt too ("eoi"). In my OS I set "automatically eoi" different to MSDOS...
  :