From 930a04473c4ed692f9c62bbbe9fe3a2e7e193de1 Mon Sep 17 00:00:00 2001
From: Loic Nageleisen <loic.nageleisen@gmail.com>
Date: Sun, 8 Apr 2012 18:24:39 +0200
Subject: [PATCH] JSR implemented

---
 dcpu_16.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dcpu_16.py b/dcpu_16.py
index 6c2f90d..78de45b 100644
--- a/dcpu_16.py
+++ b/dcpu_16.py
@@ -46,8 +46,9 @@ class valcode(object):
 @opcode(0x0, 0x01)
 def JSR(c, a):
     """pushes the address of the next instruction to the stack, then sets PC to a"""
-    #pushnext
-    c.pc = c[a]
+    c.sp = (c.sp - 1) & wmask
+    c.m[c.sp] = c.pc
+    c.pc = a()
 
 @opcode(0x1)
 def SET(c, a, b):