Add initial source files for Tic-Tac-Toe game implementation

Signed-off-by: Elmar Kresse <elmar.kresse@stud.htwk-leipzig.de>

sound.asm

@@ -0,0 +1,45 @@
+;****************************************
+;   Elmar Kresse 19-INB-1 (2021)
+;   sound.asm
+;   file contains source code for
+;   only playing sounds
+;
+;       - playbeep PROC
+;source: http://muruganad.com/8086/8086-assembly-language-program-to-play-sound-using-pc-speaker.html
+;****************************************
+
+
+playbeep PROC
+       MOV AL, 182
+       OUT 43h, AL
+   beep:
+    
+       ;set frequency
+          MOV AX, [BX]
+          OUT 42h, AL
+          MOV AL, AH
+          OUT 42h, AL
+       ;sound on
+          IN AL, 61h
+          OR AL, 00000011b
+          OUT 61h, AL
+
+      ADD BX, 4
+      MOV WORD ptr [CS:timer_ticks], 0
+      
+      ;break
+          timer_loop:
+          CMP WORD ptr [CS:timer_ticks], 3
+          jne timer_loop
+          MOV WORD ptr [CS:timer_ticks], 0
+
+       ;sound off
+          IN AL, 61h
+          AND AL, 11111100b
+          OUT 61h, AL
+        
+        ADD BX, 4
+        SUB CX, 8
+        JNE beep
+        ret
+playbeep ENDP