From 20318b98590909382901bfffd4695c6de8621a21 Mon Sep 17 00:00:00 2001
From: Steven Hugg <hugg@fasterlight.com>
Date: Wed, 28 Aug 2019 15:21:33 -0400
Subject: [PATCH] nes: IO read/write for registers

---
 src/platform/nes.ts | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/platform/nes.ts b/src/platform/nes.ts
index bec7a5c4..6197d694 100644
--- a/src/platform/nes.ts
+++ b/src/platform/nes.ts
@@ -212,28 +212,30 @@ class JSNESPlatform extends Base6502Platform implements Platform, Probeable {
     if (!mmap.haveProxied) {
       var oldload = mmap.load.bind(mmap);
       var oldwrite = mmap.write.bind(mmap);
-      //var oldregLoad = mmap.regLoad.bind(mmap);
-      //var oldregWrite = mmap.regWrite.bind(mmap);
+      var oldregLoad = mmap.regLoad.bind(mmap);
+      var oldregWrite = mmap.regWrite.bind(mmap);
+      var lastioaddr = -1;
       mmap.load = (addr) => {
         var val = oldload(addr);
-        this.probe.logRead(addr, val);
+        if (addr != lastioaddr) this.probe.logRead(addr, val);
         return val;
       }
       mmap.write = (addr, val) => {
-        this.probe.logWrite(addr, val);
+        if (addr != lastioaddr) this.probe.logWrite(addr, val);
         oldwrite(addr, val);
       }
-      /*
+      // try not to read/write then IOread/IOwrite at same time
       mmap.regLoad = (addr) => {
         var val = oldregLoad(addr);
         this.probe.logIORead(addr, val);
+        lastioaddr = addr;
         return val;
       }
       mmap.regWrite = (addr, val) => {
         this.probe.logIOWrite(addr, val);
+        lastioaddr = addr;
         oldregWrite(addr, val);
       }
-      */
       mmap.haveProxied = true;
     }
     var ppu = this.nes.ppu;