Fill memory on init, organize tests, housekeeping

src/app/emu/cpu.h

@@ -328,6 +328,11 @@ class CPU : public Memory {
   // Helper function to get the value of a specific flag bit
   bool GetFlag(uint8_t mask) const { return (status & mask) != 0; }
 
+  void ClearMemory() override { memory.ClearMemory(); }
+  void LoadData(const std::vector<uint8_t>& data) override {
+    memory.LoadData(data);
+  }
+
   // Appease the C++ Gods...
   uint8_t operator[](int i) const override { return 0; }
   uint8_t at(int i) const override { return 0; }

src/app/emu/mem.h

@@ -11,7 +11,7 @@ namespace emu {
 
 class DirectPageMemory {
  public:
-  DirectPageMemory(size_t size = 256) : memory_(size, 0) {}
+  explicit DirectPageMemory(size_t size = 256) : memory_(size, 0) {}
 
   uint8_t ReadByte(uint8_t address) const { return memory_[address]; }
 
@@ -35,6 +35,8 @@ class Memory {
   virtual void WriteWord(uint32_t address, uint16_t value) = 0;
 
   virtual void SetMemory(const std::vector<uint8_t>& data) = 0;
+  virtual void ClearMemory() = 0;
+  virtual void LoadData(const std::vector<uint8_t>& data) = 0;
 
   virtual uint8_t operator[](int i) const = 0;
   virtual uint8_t at(int i) const = 0;
@@ -75,6 +77,12 @@ class MemoryImpl : public Memory {
 
   void SetMemory(const std::vector<uint8_t>& data) override { memory_ = data; }
 
+  void ClearMemory() override { memory_.resize(64000, 0x00); }
+
+  void LoadData(const std::vector<uint8_t>& data) override {
+    std::copy(data.begin(), data.end(), memory_.begin());
+  }
+
   uint8_t at(int i) const override { return memory_[i]; }
   auto size() const { return memory_.size(); }
   auto begin() const { return memory_.begin(); }

src/app/gfx/scad_format.cc

@@ -3,6 +3,7 @@
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>
+#include <fstream>
 #include <iostream>
 #include <memory>
 #include <vector>