Add INX and INY instructions

src/6502/6502.h

@@ -38,6 +38,9 @@ typedef unsigned short word; // 16 bit
 
 #define INS_NOP 0xEA // NOP
 
+#define INS_INX 0xE8 // INX Implied
+#define INS_INY 0xC8 // INY Implied
+
 struct MEMORY {
 	byte memory[MAX_MEMORY];
 };

src/6502/main.c

@@ -162,8 +162,7 @@ void execute() {
 				cpu.Z = (cpu.A == 0);
 				cpu.N = (cpu.A & 0b1000000) > 0;
 				cpu.PC++;
-			        break;
-		        
+			        break;		        
 				
 	   		case INS_JSR:
 				word jsr_addr = fetch_word();
@@ -176,6 +175,16 @@ void execute() {
 				break;
 		        case INS_NOP:
 			        break;
+         		case INS_INX:
+			        cpu.X++;
+			        cpu.Z = (cpu.X == 0);
+				cpu.N = (cpu.X & 0b1000000) > 0;
+			        break;
+		        case INS_INY:
+			        cpu.Y++;
+			        cpu.Z = (cpu.Y == 0);
+				cpu.N = (cpu.Y & 0b1000000) > 0;
+			        break;
 		        case 0x00: // EOF
 			        return;
 			default: