From 620cc1aa04aa3eb4417d036315eeb10fb7c21276 Mon Sep 17 00:00:00 2001
From: Brad Grantham <grantham@plunk.org>
Date: Wed, 30 Nov 2016 10:42:36 -0800
Subject: [PATCH] More instructions: DOS Master boots (crashes to Monitor)

ORA abs, Y
ROR abs, X
---
 apple2e.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/apple2e.cpp b/apple2e.cpp
index 195e08b..7059afe 100644
--- a/apple2e.cpp
+++ b/apple2e.cpp
@@ -1770,6 +1770,15 @@ struct CPU6502
                 break;
             }
 
+            case 0x19: { // ORA abs, Y
+                int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
+                m = bus.read(addr + y);
+                if((addr + y) / 256 != addr / 256)
+                    clk++;
+                set_flags(N | Z, a = a | m);
+                break;
+            }
+
             case 0x1D: { // ORA abs, X
                 int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
                 m = bus.read(addr + x);
@@ -1856,6 +1865,16 @@ struct CPU6502
                 break;
             }
 
+            case 0x7E: { // ROR abs, X
+                int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
+                m = bus.read(addr + x);
+                bool c = isset(C);
+                flag_change(C, m & 0x80);
+                set_flags(N | Z, m = (c ? 0x80 : 0x00) | (m >> 1));
+                bus.write(addr + x, m);
+                break;
+            }
+
             case 0x3E: { // ROL abs, X
                 int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
                 m = bus.read(addr + x);