add Keyboard and Checkpointable abstractions

keyboard.h

@@ -0,0 +1,11 @@
+#ifndef _KEYBOARD_H
+#define _KEYBOARD_H
+
+class Keyboard {
+public:
+	virtual void up(byte) = 0;
+	virtual void down(byte) = 0;
+	virtual void reset() = 0;
+};
+
+#endif

memory.h

@@ -6,6 +6,14 @@
 
 typedef unsigned char byte;
 
+class Stream;
+
+class Checkpointable {
+public:
+	virtual void checkpoint(Stream &s) = 0;
+	virtual void restore(Stream &s) = 0;
+};
+
 class Memory {
 public:
 	typedef unsigned short address;

r65emu.h

@@ -9,6 +9,7 @@
 #include "prom.h"
 #include "ps2drv.h"
 #include "utftdisplay.h"
+#include "keyboard.h"
 #include "hardware.h"
 
 #endif

ram.h

@@ -1,13 +1,13 @@
 #ifndef _RAM_H
 #define _RAM_H
 
-class ram: public Memory::Device {
+class ram: public Memory::Device, public Checkpointable {
 public:
 	virtual void operator= (byte c) { _mem[_acc] = c; }
 	virtual operator byte () { return _mem[_acc]; }
 
-  void checkpoint(Stream &s) { s.write(_mem, sizeof(_mem)); }
+	virtual void checkpoint(Stream &s) { s.write(_mem, sizeof(_mem)); }
-  void restore(Stream &s) { s.readBytes((char *)_mem, sizeof(_mem)); }
+	virtual void restore(Stream &s) { s.readBytes((char *)_mem, sizeof(_mem)); }
 
 	ram (): Memory::Device(sizeof(_mem)) {}
 

spiram.h

@@ -1,13 +1,13 @@
 #ifndef __SPIRAM_H__
 #define __SPIRAM_H__
 
-class spiram: public Memory::Device {
+class spiram: public Memory::Device, public Checkpointable {
 public:
 	virtual void operator= (byte c);
 	virtual operator byte ();
 
-  void checkpoint(Stream &s);
+	virtual void checkpoint(Stream &s);
-  void restore(Stream &s);
+	virtual void restore(Stream &s);
 
 	spiram(int bytes): Memory::Device(bytes) {}
 	void begin(byte cs, int module);

utftdisplay.h

@@ -3,13 +3,16 @@
 
 class Stream;
 
-class UTFTDisplay: public Memory::Device {
+class UTFTDisplay: public Memory::Device, public Checkpointable {
 public:
 	void begin(unsigned bg, unsigned fg);
 	void clear();
 	void error(char *);
 	void status(const char *);
 
+	virtual void checkpoint(Stream &s) = 0;
+	virtual void restore(Stream &s) = 0;
+
 protected:
 	UTFTDisplay(unsigned size): Memory::Device(size) {}