From 3d81f09a6974389e5da0c366d13bd3128c1a7384 Mon Sep 17 00:00:00 2001
From: wixette <wixette@gmail.com>
Date: Sat, 7 Mar 2020 02:38:38 +0800
Subject: [PATCH] fix bug in readPort function

---
 js/sim8800.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/js/sim8800.js b/js/sim8800.js
index ac25b68..a132884 100644
--- a/js/sim8800.js
+++ b/js/sim8800.js
@@ -249,8 +249,8 @@ class Sim8800 {
         return function(address) {
             var value = 0;
             // We only care about the port 0xff.
-            if (address == 0xff && this.getInputAddressCallback) {
-                var word = this.getInputAddressCallback();
+            if (address == 0xff && self.getInputAddressCallback) {
+                var word = self.getInputAddressCallback();
                 return word >> 8;
             }
             return value;