 ;Chess.asm - Write a program that draws an 8 x 8 chess board, with alternating 
;gray and white squares.  You can use the SetTextColor and Gotoxy procedures in 
;the Irvine32 library.  Avoid the user of global variables, and use declared 
;parameters in all procedures.

.386
.stack 4096
ExitProcess proto, dwExitCode:dword

printRows PROTO, square:BYTE, rowNum:DWORD
oneSquare PROTO, square:BYTE
checkOddEven PROTO, rowNum:DWORD
setColor PROTO, textColor:DWORD, backgroundColor:DWORD

.data
rows DWORD 8
columns DWORD 8

.code
main PROC
	INVOKE printRows, ' ', 1
	call Crlf
main ENDP

;-----------------------------------------------
printRows PROC, square:BYTE, rowNum:DWORD
;
;
; Receives: A char in square:BYTE (' ')
;			A row # 1-8 in rowNum:DWORD
;
; Returns: Nothing
;-----------------------------------------------
	mov ecx, columns
	INVOKE checkOddEven, rowNum
	jnc evenRow
oddRow:
	INVOKE setColor, white, white
	push ecx
	INVOKE oneSquare, square
	INVOKE setColor, black, black
	INVOKE oneSquare, square
	pop ecx
	sub ecx, 2
	cmp ecx, 0
	jnz oddRow
	jz Quit
evenRow:
	INVOKE setColor, black, black
	push ecx
	INVOKE oneSquare, square
	INVOKE setColor, white, white
	INVOKE oneSquare, square
	pop ecx
	sub ecx, 2
	cmp ecx, 0
	jnz evenRow
Quit:
	ret
 printRows ENDP

;-----------------------------------------------
oneSquare PROC, square:BYTE
;
;
; Receives: A char in square:BYTE (' ')
;
; Returns:  Prints char to console
;-----------------------------------------------
	mov ecx, 4
	mov al, square
L1:
	
	loop L1

	ret
oneSquare ENDP

;-----------------------------------------------
checkOddEven PROC, rowNum:DWORD
;
;
; Receives: A row # 1-8 in rowNum:DWORD
;
; Returns:  Sets carry flag for odd
;			Clears carry flag for even
;-----------------------------------------------
	mov eax, rowNum
	test eax, 00000001b
	jz evenNum
	stc
	ret
evenNum:
	clc
	ret
 checkOddEven ENDP

;-----------------------------------------------
setColor PROC, textColor:DWORD, backgroundColor:DWORD
;
;
; Receives: A text color from Irvine32.inc's
;			SetTextColor procedure in
;			textColor:DWORD and backgroundColor:DWORD
;
; Returns: Nothing
;-----------------------------------------------
	mov eax, backgroundColor
	shl eax, 4
	add eax, textColor
	ret
setColor ENDP
END main

created 1 year ago

Assembly Online Compiler

Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.

About Assembly

Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.

Every assembler may have it's own assembly language designed for a specific computers or an operating system.

Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.

Syntax help

Assembly language usually consists of three sections,

Data section

To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section

To declare variables
text section

_start specifies the starting of this section where the actually code is written.

Variables

There are various define directives to allocate space for variables for both initialized and uninitialized data.

1. To allocate storage space to Initialized data

Syntax

variable-name    define-directive    initial-value

Define Directive	Description	Allocated Space
DB	Define Byte	1 byte
DW	Define Word	2 bytes
DD	Define Doubleword	4 bytes
DQ	Define Quadword	8 bytes
DT	Define Ten Bytes	10 bytes

2. To allocate storage space to un-initialized data

Define Directive	Description
RESB	Reserve a Byte
RESW	Reserve a Word
RESD	Reserve a Doubleword
RESQ	Reserve a Quadword
REST	Reserve a Ten Bytes

Constants

Constants can be defined using

1. equ

To define numeric constants

CONSTANT_NAME EQU regular-exp or value

2. %assign

To define numeric constants.

%assign constant_name value

3. %define

To define numeric or string constants.

%define constant_name value

Loops

Loops are used to iterate a set of statements for a specific number of times.

mov ECX,n
L1:
;<loop body>
loop L1

where n specifies the no of times loops should iterate.

Procedures

Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

procedure_name:
   ;procedure body
   ret