From 18d15758f562386e35ee5df0ba64ff82b22dd2e7 Mon Sep 17 00:00:00 2001
From: Cacodemon345 <wahil1976@outlook.com>
Date: Sun, 4 Sep 2022 00:27:05 +0600
Subject: [PATCH] Don't set ZF on MUL/MULU operations on NEC V20/V30 (#2)

---
 src/cpu/808x.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/cpu/808x.c b/src/cpu/808x.c
index a762fdae0..0ab969fe5 100644
--- a/src/cpu/808x.c
+++ b/src/cpu/808x.c
@@ -1451,9 +1451,7 @@ set_co_mul(int bits, int carry)
 {
     set_cf(carry);
     set_of(carry);
-    /* NOTE: When implementing the V20, care should be taken to not change
-	     the zero flag. */
-    set_zf_ex(!carry);
+    if (!is_nec) set_zf_ex(!carry);
     if (!carry)
 	wait(1, 0);
 }