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diff --git a/include/zx81.h b/include/zx81.h
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+/*
+
+    ds81 - Nintendo DS ZX81 emulator
+
+    Copyright (C) 2006  Ian Cowburn (ianc@noddybox.co.uk)
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    -------------------------------------------------------------------------
+
+    Provides the emulation for the ZX81
+
+*/
+
+#ifndef DS81_ZX81_H
+#define DS81_ZX81_H
+
+#include <stdio.h>
+
+#include "z80.h"
+#include "keyboard.h"
+
+
+/* Initialise the ZX81
+*/
+void	ZX81Init(uint16 *text_vram, uint16 *bitmap_vram, Z80 *z80);
+
+/* Handle keypresses
+*/
+void	ZX81HandleKey(SoftKey k, int is_pressed);
+
+/* Enable fopen() loading of tape files
+*/
+void	ZX81EnableFileSystem(int enable);
+
+/* Set a file to load from tape
+*/
+void	ZX81SetTape(const Z80Byte *image, int len);
+
+/* Reset the 81
+*/
+void	ZX81Reset(Z80 *z80);
+
+/* Tell the 81 that config may have changed.
+*/
+void	ZX81Reconfigure(void);
+
+/* Displays a string on the ZX81's dislpay.  The screen is cleared and the
+   string displayed with \n characters breaking the line.
+
+   Not all characters can be respresented by the ZX81, and the screen will be
+   lost on the next emulation update cycle.
+
+   The character '%' toggles inverse video.
+
+   ZX81SuspendDisplay() and ZX81ResumeDisplay() should be called so that the
+   ZX81 can set up its internals.
+*/
+void	ZX81DisplayString(const char *p);
+void	ZX81SuspendDisplay(void);
+void	ZX81ResumeDisplay(void);
+
+/* Interfaces for the Z80
+*/
+Z80Byte	ZX81ReadMem(Z80 *z80, Z80Word addr);
+void	ZX81WriteMem(Z80 *z80, Z80Word addr, Z80Byte val);
+Z80Byte	ZX81ReadPort(Z80 *z80, Z80Word port);
+void	ZX81WritePort(Z80 *z80, Z80Word port, Z80Byte val);
+
+#define	ZX81ReadDisassem ZX81ReadMem
+
+/* Interfaces to allows the ZX81 to save/load itself as a snapshot to/from
+   a stream.
+*/
+void	ZX81SaveSnapshot(FILE *fp);
+void	ZX81LoadSnapshot(FILE *fp);
+
+#endif
+
+
+/* END OF FILE */