From 4a9456f83fd512503d7d0d3edad8dcea95b415c0 Mon Sep 17 00:00:00 2001
From: Preston Skupinski <skupinsk@cse.msu.edu>
Date: Mon, 11 Jul 2011 19:04:51 -0400
Subject: [PATCH] added a reset function

---
 cpu.js     | 17 ++++++++++++++++-
 index.html |  2 +-
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/cpu.js b/cpu.js
index e7fef77..012069b 100644
--- a/cpu.js
+++ b/cpu.js
@@ -251,7 +251,8 @@ function CPU_65816() {
   this.execute = function(raw_hex, has_header) {
     this.mmu.load_rom(raw_hex);
     this.r.pc = 0x8000;
- 
+
+    // Skip the header(the first 512 bytes) if there is one present for now.
     if(has_header) {
       this.r.pc += 4096;
     }
@@ -366,6 +367,15 @@ function CPU_65816() {
         executing = false;
     }
   }; 
+
+  this.reset = function() {
+    this.waiting = false;
+    this.stopped = false;
+    this.interrupt = this.INTERRUPT.NO_INTERRUPT;
+    this.r = { a:0, b:0, x:0, y:0, d:0, s:0xff, pc:0, dbr:0, k:0 };
+    this.p = { e:1, c:0, z:0, i:0, d:0, x:0, m:0, v:0, n:0 };
+    this.mmu.reset();  
+  }; 
 }
 
 var MMU = {
@@ -373,6 +383,11 @@ var MMU = {
   memory: { 0: {} },
   memory_mapped_io_devices: {},
 
+  reset: function() {
+    this.memory ={ 0: {} };
+    this.memory_mapped_io_devices = {};
+  },
+
   add_memory_mapped_io_device: function(write_callback, read_callback, bank, 
                                         location) {
     if(typeof this.memory_mapped_io_devices[bank] === 'undefined') {
diff --git a/index.html b/index.html
index a1a661d..74341bb 100644
--- a/index.html
+++ b/index.html
@@ -13,7 +13,7 @@ $(document).ready(function() {
     updateFields();
   });
   $("#reset").click(function() {
-    cpu = new CPU_65816();
+    cpu.reset();
     $("#hex").val("");
     updateFields();
   });