From 87fc2ea2d7ce81d1edd1b2e7e5241c03dad5dbd4 Mon Sep 17 00:00:00 2001
From: Sven Riwoldt <sven.riwoldt@me.com>
Date: Thu, 30 Mar 2023 20:26:18 +0200
Subject: [PATCH] =?UTF-8?q?fertige=20L=C3=B6sung=20zur=20Analyse?=
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---
 projects/04/tests/hackviaki.asm  | 34 +++++++++++++++++++++++
 projects/04/tests/hackviaki2.asm | 47 ++++++++++++++++++++++++++++++++
 projects/04/tests/loop.asm       |  4 +++
 3 files changed, 85 insertions(+)
 create mode 100644 projects/04/tests/hackviaki.asm
 create mode 100644 projects/04/tests/hackviaki2.asm

diff --git a/projects/04/tests/hackviaki.asm b/projects/04/tests/hackviaki.asm
new file mode 100644
index 0000000..38ccedc
--- /dev/null
+++ b/projects/04/tests/hackviaki.asm
@@ -0,0 +1,34 @@
+// Assemblerprogramm zum Zeichnen der mittleren fünf Pixel des HACK-Monitors schwarz
+
+// Initialisierung der Register
+@SCREEN  // Adresse des ersten mittleren Pixels
+D=A
+@R15  // Speicherregister für den Zeiger auf den Bildschirmspeicher
+M=D
+
+// Setzen der Bits für die mittleren fünf Pixel
+@5  // Anzahl der zu setzenden Bits
+D=A
+@R14  // Zähler für die Anzahl der zu setzenden Bits
+M=D
+
+(LOOP)
+@R14
+D=M
+@END
+D;JEQ  // Wenn alle Bits gesetzt wurden, Schleife beenden
+
+@R15
+A=M
+M=-1  // Setze das Bit auf 1 (negative Logik für schwarz)
+
+@R15
+M=M+1  // Zeiger auf das nächste Bit im Speicher erhöhen
+@R14
+M=M-1  // Anzahl der zu setzenden Bits reduzieren
+@LOOP
+
+// Programm beendet
+(END)
+@END
+0;JMP
diff --git a/projects/04/tests/hackviaki2.asm b/projects/04/tests/hackviaki2.asm
new file mode 100644
index 0000000..87b30e8
--- /dev/null
+++ b/projects/04/tests/hackviaki2.asm
@@ -0,0 +1,47 @@
+// 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. When no key is pressed, the
+// program clears the screen, i.e. writes "white" in every pixel.
+
+
+(INIT)  	//initializes i - index that runs on the screen's pixels
+	@8192	 // 32 * 256 number of 16 bit pixel lines to cover the entire screen
+	D=A
+	@i                   //initializes the index variable to 8192, this is the remaining address left to color onscreen
+	M=D
+
+(LOOP)	           //progresses the index backwards. 
+	@i
+	M=M-1
+	D=M
+	@INIT
+	D;JLT               //if index<0 - go to INDEX INITIALIZER to reset it
+	@KBD	            //loads the keyboard's address
+	D=M
+	@WHITE		        //if (Memory at keyboard address == 0) - meaning no key is pressed - go to WHITE, else go to BLACK
+	D;JEQ
+	@BLACK
+	0;JMP
+
+(BLACK)             
+	@SCREEN            //loads the screen's first address - 16384 (0x4000)
+	D=A
+	@i
+	A=D+M              //adds the current index to the screen's first address in order to color the current set of 16 pixels
+	M=-1               //sets value in current address to -1, so that the whole word 1...1 (16bits long),  meaning - all 16 pixels will be "painted" black.
+	@LOOP              //jumps back to indexer in order to progress the index backwards.
+	0;JMP
+
+(WHITE)
+	@SCREEN            //loads the screen's first address - 16384 (0x4000)
+	D=A                
+	@i        
+	A=D+M              //adds the current index to the screen's first address in order to color the current set of 16 pixels
+	M=0                //sets value in current address to 0, so that the whole word will be 0....0 (16bits long), meaning - all 16 pixels will be "painted" white.
+	@LOOP           //jumps back to indexer in order to progress the index backwards.
+	0;JMP
\ No newline at end of file
diff --git a/projects/04/tests/loop.asm b/projects/04/tests/loop.asm
index 5fd0099..70f2818 100644
--- a/projects/04/tests/loop.asm
+++ b/projects/04/tests/loop.asm
@@ -15,4 +15,8 @@ M=D
 (LOOP)
 @actpos
 D=M
+@SCREEN
+D=D+M
+M=D
+MD=M-1
 @endpos