Sher70ck

ASM/README.md

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+### Instructions
+First, you will need:
+- qemu (on linux : sudo apt-get install qemu
+
+Then run:
+```
+$ nasm -f bin hello.asm -o hello.bin
+$ qemu-system-i386 hello.bin
+```
+
+<img src="hello.png" />

ASM/hello.asm

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+org 0x7c00
+jmp main
+
+
+msg db 'HELLO WORLD',0
+
+
+getchar:
+	mov ah, 0x0
+	int 16h
+	ret
+scanf:
+	scan_loop:
+		call getchar
+
+
+		cmp al, 13
+		je scan_end
+
+		mov ah, 0xe
+		int 10h	
+		mov ah, 0	
+
+		cmp al, 8
+		je backspace
+		inc dx
+
+		stosb
+		jmp scan_loop
+
+	backspace:
+		cmp dx, 0
+		je scan_loop
+		add dx, -1
+		mov byte[di], 0
+		add di, -1
+		mov ah, 0xe
+		mov al, 0
+		int 10h
+		mov al, 8
+		int 10h
+		mov ah, 0
+		xor ax, ax
+		jmp scan_loop
+
+
+	scan_end:
+		mov ah, 0xe
+		call endl
+		xor ax, ax
+		stosb
+	ret
+putchar:
+
+	mov ah, 0xe
+	int 10h
+	ret
+endl:
+	mov ah,0xe
+	mov al, 10
+	xor cx, cx
+	int 10h
+	endl_loop:
+		cmp cx, dx
+		je endl_loop_end
+		mov al, 8
+		int 10h
+		inc cx
+		jmp endl_loop
+	endl_loop_end:
+		mov ah, 0xe
+		mov bl, 10
+		mov cx, 01h
+ret
+
+printf:
+	xor dx, dx
+	print_loop:
+		lodsb
+		cmp al,0
+		je end_print
+		inc dx
+		call putchar
+		jmp print_loop
+	end_print:
+		call endl
+	ret
+
+
+main:
+
+	xor ax, ax
+	mov bx, ax
+	mov cx, ax
+	mov dx, ax
+
+
+
+	mov ah, 0
+	mov al, 13h
+	int 10h
+
+	mov ah, 0xb
+	mov bh, 0
+	mov bl, 4
+	int 10h
+
+	mov ah, 0xe
+	mov al, 8
+	mov bh, 0
+	mov bl, 0xf
+	mov cx, 01h
+	int 10h
+
+
+
+	mov si, msg
+	mov di, msg
+	call printf
+
+
+		jmp $
+times 510-($-$$) db 0
+dw 0xaa55
+