1 files changed, 8 insertions, 0 deletions
diff --git a/emu/6502.h b/emu/6502.h
index 1880c90..c3143e7 100644
--- a/emu/6502.h
+++ b/emu/6502.h
@@ -20,6 +20,8 @@ typedef struct
 	int debug_flags;
 	
 	int steps;
+	
+	int error_state;
 } cpu_6502_t;
 
 // debug flags
@@ -29,6 +31,12 @@ enum {
 	DEBUG_STACK     = 0x04
 };
 
+// error state
+enum {
+	ERROR_STATE_OK             = 0x00,
+	ERROR_STATE_ILLEGAL_OPCODE = 0x01
+};
+
 // processor state bits
 enum {
 	PS_N = 0x80,