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diff --git a/src/state.h b/src/state.h
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+++ b/src/state.h
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+/*
+
+    casm - Simple, portable assembler
+
+    Copyright (C) 2003-2015  Ian Cowburn (ianc@noddybox.demon.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 3 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, see <http://www.gnu.org/licenses/>.
+
+    -------------------------------------------------------------------------
+
+    Stores assembly state.
+
+*/
+
+#ifndef CASM_STATE_H
+#define CASM_STATE_H
+
+/* ---------------------------------------- TYPES
+*/
+typedef enum
+{
+    MSB_Word,
+    LSB_Word
+} WordMode;
+
+/* ---------------------------------------- INTERFACES
+*/
+
+/* Clear state to default.  This creates 64K of RAM to write into.
+*/
+void    ClearState(void);
+
+
+/* Sets the number of bytes in RAM.  Addressing always starts from zero.
+*/
+void    SetAddressSpace(int size);
+
+
+/* Move onto the next pass
+*/
+void    NextPass(void);
+
+
+/* Is final pass?
+*/
+int     IsFinalPass(void);
+
+
+/* Is first pass?
+*/
+int     IsFirstPass(void);
+
+
+/* Is intermediate pass?
+*/
+int     IsIntermediatePass(void);
+
+
+/* Set number of passes needed.  This works while IsFinalPass() returns FALSE.
+*/
+int     SetNeededPasses(int n);
+
+
+/* Set the current PC
+*/
+void    SetPC(int i);
+
+
+/* Set the mode to write words in
+*/
+void    SetWordMode(WordMode mode);
+
+
+/* Get the current PC
+*/
+int     PC(void);
+
+
+/* Add a number to the PC
+*/
+void    PCAdd(int i);
+
+
+/* Write a byte to the PC and increment it
+*/
+void    PCWrite(int i);
+
+
+/* Write a word to the PC and increment it
+*/
+void    PCWriteWord(int i);
+void    PCWriteWordMode(int i, WordMode mode);
+
+
+/* Get the minimum address written to
+*/
+int     GetMinAddressWritten(void);
+
+
+/* Get the maximum address written to
+*/
+int     GetMaxAddressWritten(void);
+
+
+/* Access the address space directly
+*/
+const Byte *AddressSpace(void);
+
+
+/* Read a byte from the address space
+*/
+Byte    ReadByte(int addr);
+
+
+#endif
+
+/*
+vim: ai sw=4 ts=8 expandtab
+*/