add 00FD opcode

src/chip_emu.cpp

@@ -102,6 +102,8 @@ void ChipEmu::init()
 	for (int i=0; i < 8; i++)
 		hp48_flags[i] = 0;
 
+	stop = false;
+
 	mode = 0;
 }
 
@@ -237,6 +239,11 @@ void ChipEmu::executeNextOpcode()
 						screen[127][y] = 0;
 					}
 					break;
+
+				case 0xFD:		// 00FD - Quit the emulator
+					stop = true;
+					cout << "Quit the emulator" << endl;
+					break;
 
 				case 0xFE:		// 00FE - disable extended screen mode *SCHIP*
 					mode = 0;

src/chip_emu.h

@@ -48,6 +48,8 @@ class ChipEmu
 	unsigned char key[16];			// 0 - KEY_RELEASED
 									// 1 - KEY_PRESSED
 
+	bool stop;						// for 00FD opcode
+
 	ChipEmu();
 	void init();
 	bool loadGame(const char *filename);

src/sdl/main.cpp

@@ -157,6 +157,8 @@ int main(int argc, char *argv[])
 
 				opcode_count = 0;
 			}
+
+			if (emu.stop) done = true;
 		}
 	}