setup getters and setters for combined registers

journal/Day 2 - 2025.04.19.md

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+# For the day:
+- Setup registers reads and writes
+
+# Conclusion
+- Can read and write to combined registers
+- Using a private function in the cpu to work with combined registers
+- Have named functions for the used combined registers for ease of use
+- Added unit tests for the combined registers