From ee26b46ddab3aa099df0b79486566f032baa9f77 Mon Sep 17 00:00:00 2001
From: folkert van heusden <mail@vanheusden.com>
Date: Mon, 1 Apr 2024 15:48:29 +0200
Subject: [PATCH] N flag depends on bit 15

---
 op00.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/op00.py b/op00.py
index 3b7f7f8..76af778 100644
--- a/op00.py
+++ b/op00.py
@@ -285,7 +285,7 @@ def op00_66_mtpi(cpu, inst, opsize=2):
     targetspace = (cpu.mmu.DSPACE, cpu.mmu.ISPACE)[opsize - 1]
     w = cpu.stackpop()
 
-    cpu.psw_n = w & cpu.MASK16
+    cpu.psw_n = w & cpu.SIGN16
     cpu.psw_z = (w == 0)
     cpu.psw_v = 0