diff --git a/src/emulation.c b/src/emulation.c
index fc090e6..c29c0dd 100644
--- a/src/emulation.c
+++ b/src/emulation.c
@@ -10,10 +10,16 @@ emul_lda(rk65c02emu_t *e, instruction_t *i)
 
 	e->regs.A = instruction_data_read_1(e, &id, i);
 
-
 	/* adjust status flags */
+	if (e->regs.A & NEGATIVE)
+		e->regs.P |= P_NEGATIVE;
+	else
+		e->regs.P &= ~P_NEGATIVE;
 
- 
+	if (e->regs.A == 0)
+		e->regs.P |= P_ZERO;
+	else
+		e->regs.P &= ~P_ZERO;
 }
 
 void
diff --git a/src/rk65c02.h b/src/rk65c02.h
index 95e7cce..6b0e698 100644
--- a/src/rk65c02.h
+++ b/src/rk65c02.h
@@ -28,6 +28,8 @@ struct reg_state {
 #define P_SIGN_OVERFLOW 0x40
 #define P_NEGATIVE 0x80
 
+#define NEGATIVE P_NEGATIVE
+
 typedef struct reg_state reg_state_t;
 
 struct rk65c02emu {