diff --git a/projects/04/abgabe/Fill.asm b/projects/04/abgabe/Fill.asm
new file mode 100644
index 0000000..b12d173
--- /dev/null
+++ b/projects/04/abgabe/Fill.asm
@@ -0,0 +1,78 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/04/Fill.asm
+
+// Runs an infinite loop that listens to the keyboard input.
+// When a key is pressed (any key), the program blackens the screen,
+// i.e. writes "black" in every pixel;
+// the screen should remain fully black as long as the key is pressed. 
+// When no key is pressed, the program clears the screen, i.e. writes
+// "white" in every pixel;
+// the screen should remain fully clear as long as no key is pressed.
+
+// Put your code here.
+
+@8192  // 32*256  --> 32 16er pro Zeile
+D=A
+@ENDPOS    // in @16
+M=D
+
+(LOOP)
+    @SCREEN     //Screen-Einstiegsadresse
+    D=A
+    @ScreenStart        //@SCREEN 16384 --> @17
+    M=D
+
+    @i          //Zähler = 0 18
+    M=0
+
+    @KBD        //24576
+    D=M         //Tastatureingabe ?
+
+    @WEISS
+    D; JEQ      //WEISS WENN D == 0
+    @SCHWARZ    //SPRINGE ZU SCHWARZ
+    D; JNE      //WENN NICHT 0
+
+(SCHWARZ)
+    @ENDPOS
+    D=M
+    @i
+    D=D-M       //ENDPOS -1 = 0 ?  DANN ZU LOOP
+    @LOOP
+    D;JEQ   
+
+    @ScreenStart 
+    A=M
+    M=-1        //SETZE -1 == SCHWARZ
+
+    @i
+    M=M+1       //i++
+
+    @ScreenStart 
+    M=M+1
+
+    @SCHWARZ
+    0;JMP
+
+(WEISS)
+    @ENDPOS
+    D=M
+    @i
+    D=D-M       //ENDPOS -1 = 0 ?  DANN ZU LOOP 
+    @LOOP
+    D;JEQ   
+
+    @ScreenStart 
+    A=M
+    M=0         //SETZE 0 == WEISS
+
+    @i
+    M=M+1       //i++
+
+    @ScreenStart 
+    M=M+1
+
+    @WEISS
+    0;JMP
\ No newline at end of file
diff --git a/projects/04/abgabe/Mult.asm b/projects/04/abgabe/Mult.asm
new file mode 100644
index 0000000..9be9c05
--- /dev/null
+++ b/projects/04/abgabe/Mult.asm
@@ -0,0 +1,41 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/04/Mult.asm
+
+// Multiplies R0 and R1 and stores the result in R2.
+// (R0, R1, R2 refer to RAM[0], RAM[1], and RAM[2], respectively.)
+//
+// This program only needs to handle arguments that satisfy
+// R0 >= 0, R1 >= 0, and R0*R1 < 32768.
+
+@R2     //Ergebnisspeicher
+M=0     //init 
+
+@R1     //R1 dieser Wert dient als Schleifencounter
+D=M     //Inhalt nach M
+
+@i      //Zähler
+M=D     //i bekommt R1-Wert
+
+@END
+D;JEQ    
+
+(LOOP)
+@R0     //R0 ansprechen
+D=M     //Wert aus R0 in Datenspeicher
+
+@R2     //Ergebnisspeicher
+M=D+M   //Ergebnisspeicher = Datenspeicher + Ergebnisspeicher
+
+@i      //Zähler
+D=M     //D=Zähler
+D=D-1   //D-1
+M=D     //Zurückschreiben in Zähler
+
+@LOOP   //LOOP
+D;JGT   //D GRÖSSER 
+
+(END)   //END LOOP
+@END
+0;JMP
\ No newline at end of file
diff --git a/projects/04/abgabe/project4.zip b/projects/04/abgabe/project4.zip
new file mode 100644
index 0000000..f54291c
Binary files /dev/null and b/projects/04/abgabe/project4.zip differ
diff --git a/projects/04/fill/Archiv.zip b/projects/04/fill/Archiv.zip
new file mode 100644
index 0000000..6dae966
Binary files /dev/null and b/projects/04/fill/Archiv.zip differ
diff --git a/projects/04/fill/Fill.asm b/projects/04/fill/Fill.asm
index 0323ffa..30d3bf7 100644
--- a/projects/04/fill/Fill.asm
+++ b/projects/04/fill/Fill.asm
@@ -1,68 +1,78 @@
-// This file is part of www.nand2tetris.org
-// and the book "The Elements of Computing Systems"
-// by Nisan and Schocken, MIT Press.
-// File name: projects/04/Fill.asm
-
-// Runs an infinite loop that listens to the keyboard input.
-// When a key is pressed (any key), the program blackens the screen,
-// i.e. writes "black" in every pixel;
-// the screen should remain fully black as long as the key is pressed. 
-// When no key is pressed, the program clears the screen, i.e. writes
-// "white" in every pixel;
-// the screen should remain fully clear as long as no key is pressed.
-
-// Put your code here.
-
-(LOOP) // Abfrage des KBD-Speichers 
-    @KBD    //Adresse Keyboardspeicher
-    D=M     //Datenregister = Speicheradresse
-
-    @KPRESSED
-    D;JGT
-
-    @NOKPRESSED
-    0;JMP
-
-(KPRESSED)      // Taste wurde/wird gedrückt
-    @R0
-    M=-1        // 11111111111111111 --> black Pixel
-    @ONSCREEN
-    0;JMP
-
-(NOKPRESSED)    // keine Taste gedrückt
-    @R0         
-    M=0         // wieder auf 0 gesetzt
-    @ONSCREEN
-    0;JMP
-
-(ONSCREEN)
-    // erste Zeile von 16384 bis 16415 => 32 
-    // 31 * 256
-    // letztes Byte --> 8192  --> 16384 + 8192 somit 8191
-    @8191	// Eingabe eines konstanten Wertes
-    D=A		// A= 8191, Übergabe an D
-    @R1
-    M=D		// R1 = 8191
-    //https://github.com/Olical/nand2tetris/blob/master/asm/fill/Fill.asm
-    (PRINT)
-
-    @SCREEN
-    D=M
-    @counter
-    D=M
-
-    M=D+1
-
-
-
-
-
-	
-	//Schleife, setze ein Register auf 0, dann addiere das zum @SCREEN. Setze die entstandene Adresse auf -1. Nun vergleiche den Zähler mit R1, wenn ungleich dann erhöhe um 1 und durchlaufe die Schleife abermals. 
-	
-    @ONSCREEN
-
-    
-
-@LOOP
-0;JMP
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/04/Fill.asm
+
+// Runs an infinite loop that listens to the keyboard input.
+// When a key is pressed (any key), the program blackens the screen,
+// i.e. writes "black" in every pixel;
+// the screen should remain fully black as long as the key is pressed. 
+// When no key is pressed, the program clears the screen, i.e. writes
+// "white" in every pixel;
+// the screen should remain fully clear as long as no key is pressed.
+
+// Put your code here.
+
+@8192  // 32*256  --> 32 16er pro Zeile
+D=A
+@ENDPOS    // in @16
+M=D
+
+(LOOP)
+    @SCREEN     //Screen-Einstiegsadresse
+    D=A
+    @ScreenStart        // @SCREEN 16384 --> @17
+    M=D
+
+    @i          // Zähler = 0 18
+    M=0
+
+    @KBD        //24576
+    D=M         // Tastatureingabe ?
+
+    @WEISS
+    D; JEQ      // WEISS WENN D == 0
+    @SCHWARZ    // SPRINGE ZU SCHWARZ
+    D; JNE      // WENN NICHT 0
+
+(SCHWARZ)
+    @ENDPOS
+    D=M
+    @i
+    D=D-M       // ENDPOS -1 = 0 ?  DANN ZU LOOP
+    @LOOP
+    D;JEQ   
+
+    @ScreenStart 
+    A=M
+    M=-1        // SETZE -1 == SCHWARZ
+
+    @i
+    M=M+1       // i++
+
+    @ScreenStart 
+    M=M+1
+
+    @SCHWARZ
+    0;JMP
+
+(WEISS)
+    @ENDPOS
+    D=M
+    @i
+    D=D-M       // ENDPOS -1 = 0 ?  DANN ZU LOOP 
+    @LOOP
+    D;JEQ   
+
+    @ScreenStart 
+    A=M
+    M=0         // SETZE 0 == WEISS
+
+    @i
+    M=M+1       // i++
+
+    @ScreenStart 
+    M=M+1
+
+    @WEISS
+    0;JMP
\ No newline at end of file