How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Z80 Assembly programming language

Published on 12 May 2024 09:40 PM
#Z80 assembly

How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Z80 Assembly programming language

Table of Contents

Problem Statement

Obtain a valid   Y   or   N   response from the keyboard. The keyboard should be flushed, so that any outstanding key-presses are removed, preventing any existing   Y   or   N   key-press from being evaluated. The response should be obtained as soon as   Y   or   N   are pressed, and there should be no need to press an   enter   key.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Keyboard input/Obtain a Y or N response step by step in the Z80 Assembly programming language

Source code in the z80 programming language

wait_for_key_input:
call &BB06 ;bios call, waits until key is pressed, returns key's ASCII code into A
and %11011111        ;converts to upper case
cp 'Y'              
jp z,User_Chose_Yes
cp 'N'
jp z,User_Chose_No
jp wait_for_key_input

User_Chose_Yes:
;your code for what happens when the user types "Y" goes here
ret

User_Chose_No:
;your code for what happens when the user types "N" goes here
ret

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