From aa08ce700d0f43ed1a43e8b8b147cebb98f38d3f Mon Sep 17 00:00:00 2001
From: Preston Skupinski <skupinsk@cse.msu.edu>
Date: Mon, 9 May 2011 00:34:19 -0400
Subject: [PATCH] added PHB and PLB

---
 cpu.js | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/cpu.js b/cpu.js
index 012594b..2e73536 100644
--- a/cpu.js
+++ b/cpu.js
@@ -123,9 +123,9 @@ function CPU_65816() {
                       0x6e : ROR_absolute, 0x66 : ROR_direct_page,
                       0x7e : ROR_absolute_indexed_x,
                       0x76 : ROR_direct_page_indexed_x,
-                      0x48 : PHA , 0x68 : PLA, 0x5a : PHY, 0x7a : PLY,
+                      0x48 : PHA, 0x68 : PLA, 0x5a : PHY, 0x7a : PLY,
                       0xda : PHX, 0xfa : PLX, 0x08 : PHP, 0x28 : PLP, 
-                      0xf4 : PEA, 0xd4 : PEI };
+                      0xf4 : PEA, 0xd4 : PEI, 0x8b : PHB, 0xab : PLB };
 
   /**
    * Take a raw hex string representing the program and execute it.
@@ -204,6 +204,30 @@ var MMU = {
   }
 };
 
+var PHB = {
+  bytes_required:function() {
+    return 1;
+  },
+  execute:function(cpu) {
+    cpu.mmu.store_byte(cpu.r.s--, cpu.r.dbr);
+  }
+};
+
+var PLB = {
+   bytes_required:function() {
+    return 1;
+  },
+  execute:function(cpu) {
+    cpu.r.dbr = cpu.mmu.read_byte(++cpu.r.s);
+    cpu.p.n = cpu.r.dbr >> 7;
+    if(cpu.r.dbr===0) {
+      cpu.p.z = 1;
+    } else {
+      cpu.p.z = 0;
+    }
+  } 
+};
+
 var PEA = {
   bytes_required:function() {
     return 3;