From bd3a4cdb6ccdeb4a33fa84e2c321d422cd80ab07 Mon Sep 17 00:00:00 2001
From: markusC64 <markusC64@localhost>
Date: Mon, 9 Jan 2017 20:54:58 +0100
Subject: [PATCH] Emulate Ultidos v1.0 (v2.6k)

---
 software/filemanager/dos.cc           | 8 ++++++++
 software/io/c64/c64.cc                | 3 ++-
 software/userinterface/config_menu.cc | 8 ++++++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/software/filemanager/dos.cc b/software/filemanager/dos.cc
index ad0c537b..d1eac144 100644
--- a/software/filemanager/dos.cc
+++ b/software/filemanager/dos.cc
@@ -147,6 +147,14 @@ void Dos :: parse_command(Message *command, Message **reply, Message **status)
        if (cmd >= 0x18 && cmd <= 0x1f)   command->message[1] = 0xff;
        if (cmd >= 0x26 && cmd <= 0x2f)   command->message[1] = 0xff;
     }
+    if (ultimatedosversion == -3)
+    {
+       int cmd = command->message[1];
+       if (cmd >= 0x09 && cmd <= 0x0f)   command->message[1] = 0xff;
+       if (cmd >= 0x16 && cmd <= 0x1f)   command->message[1] = 0xff;
+       if (cmd >= 0x23 && cmd <= 0x2f)   command->message[1] = 0xff;
+       if (cmd == 0x15)   command->message[1] = 0x17;
+    }
     
     switch(command->message[1]) {
         case DOS_CMD_IDENTIFY:
diff --git a/software/io/c64/c64.cc b/software/io/c64/c64.cc
index 5576d80d..b7921ca2 100644
--- a/software/io/c64/c64.cc
+++ b/software/io/c64/c64.cc
@@ -221,7 +221,8 @@ void C64 :: set_emulation_flags(cart_def *def)
         if(getFpgaCapabilities() & CAPAB_COMMAND_INTF) {
         	int choice = cfg->get_value(CFG_CMD_ENABLE);
         	CMD_IF_SLOT_ENABLE = !!choice;
-		ultimatedosversion = choice;
+		if (choice != 3 || ultimatedosversion != -3)
+		   ultimatedosversion = choice;
             CMD_IF_SLOT_BASE = 0x47; // $DF1C
 	    choice = cfg->get_value(CFG_CMD_ALLOW_WRITE);
 	    allowUltimateDosDateSet = choice;
diff --git a/software/userinterface/config_menu.cc b/software/userinterface/config_menu.cc
index 7d351f50..068898c2 100644
--- a/software/userinterface/config_menu.cc
+++ b/software/userinterface/config_menu.cc
@@ -8,6 +8,10 @@ extern "C" {
 #include "config.h"
 #include "config_menu.h"
 
+
+extern int ultimatedosversion;
+
+
 /************************/
 /* ConfigBrowser Object */
 /************************/
@@ -148,6 +152,10 @@ int ConfigBrowser :: handle_key(int c)
         	}
         	ret = -2;
             break;
+        case KEY_CTRL_HOME:
+	    if (ultimatedosversion == 3)
+	       ultimatedosversion = -3;
+	    break;
         case KEY_DOWN: // down
             state->down(1);
             break;