Add NOP instruction

src/6502/6502.h

@@ -32,6 +32,8 @@ typedef unsigned short word; // 16 bit
 #define INS_JSR 0x20 // JSR
 #define INS_RTS 0x60 // RTS
 
+#define INS_NOP 0xEA // NOP
+
 struct MEMORY {
 	byte memory[MAX_MEMORY];
 };

src/6502/main.c

@@ -148,7 +148,9 @@ void execute() {
 			case INS_RTS:
 				// TODO
 				break;
-		        case 0xFF: // EOF
+		        case INS_NOP:
+			        break;
+		        case 0x00: // EOF
 			        return;
 			default: 
 				printf("%04X: Unhandled instruction: %04X\n", cpu.PC, instruction);

src/6502/test.bin

@@ -1 +1 @@
-ｩUｨ
+<EFBFBD>Uｨ