Add Memory Controllers for SP and PP, add Instruction Set

src/Program/Block.php

@@ -2,6 +2,8 @@
 
 namespace Program;
 
+use RuntimeException;
+
 class Block
 {
 	public string $N;
@@ -20,4 +22,27 @@ class Block
 	{
 		$this->words[] = $word;
 	}
+
+
+	public function valueOf(string $register): int
+	{
+		foreach ($this->words as $word) {
+			if ($word->register === $register) {
+				return $word->value;
+			}
+		}
+
+		throw new RuntimeException("No word in block for register '$register'");
+	}
+
+
+	public function __toString()
+	{
+		$buffer = "$this->N\t";
+		foreach ($this->words as $word) {
+			$buffer .= "$word\t";
+		}
+
+		return $buffer;
+	}
 }