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diff --git a/interpreters/frotz/main.c b/interpreters/frotz/main.c
new file mode 100644
index 0000000..a403c13
--- /dev/null
+++ b/interpreters/frotz/main.c
@@ -0,0 +1,218 @@
+/* main.c - Frotz V2.40 main function
+ *	Copyright (c) 1995-1997 Stefan Jokisch
+ *
+ * This file is part of Frotz.
+ *
+ * Frotz 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.
+ *
+ * Frotz 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
+ */
+
+/*
+ * This is an interpreter for Infocom V1 to V6 games. It also supports
+ * the recently defined V7 and V8 games. Please report bugs to
+ *
+ *    s.jokisch@avu.de
+ *
+ */
+
+#include "frotz.h"
+
+#ifndef MSDOS_16BIT
+#define cdecl
+#endif
+
+extern void interpret (void);
+extern void init_memory (void);
+extern void init_undo (void);
+extern void reset_memory (void);
+
+/* Story file name, id number and size */
+
+char *story_name = 0;
+
+enum story story_id = UNKNOWN;
+long story_size = 0;
+
+/* Story file header data */
+
+zbyte h_version = 0;
+zbyte h_config = 0;
+zword h_release = 0;
+zword h_resident_size = 0;
+zword h_start_pc = 0;
+zword h_dictionary = 0;
+zword h_objects = 0;
+zword h_globals = 0;
+zword h_dynamic_size = 0;
+zword h_flags = 0;
+zbyte h_serial[6] = { 0, 0, 0, 0, 0, 0 };
+zword h_abbreviations = 0;
+zword h_file_size = 0;
+zword h_checksum = 0;
+zbyte h_interpreter_number = 0;
+zbyte h_interpreter_version = 0;
+zbyte h_screen_rows = 0;
+zbyte h_screen_cols = 0;
+zword h_screen_width = 0;
+zword h_screen_height = 0;
+zbyte h_font_height = 1;
+zbyte h_font_width = 1;
+zword h_functions_offset = 0;
+zword h_strings_offset = 0;
+zbyte h_default_background = 0;
+zbyte h_default_foreground = 0;
+zword h_terminating_keys = 0;
+zword h_line_width = 0;
+zbyte h_standard_high = 1;
+zbyte h_standard_low = 0;
+zword h_alphabet = 0;
+zword h_extension_table = 0;
+zbyte h_user_name[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+
+zword hx_table_size = 0;
+zword hx_mouse_x = 0;
+zword hx_mouse_y = 0;
+zword hx_unicode_table = 0;
+
+/* Stack data */
+
+zword stack[STACK_SIZE];
+zword *sp = 0;
+zword *fp = 0;
+zword frame_count = 0;
+
+/* IO streams */
+
+bool ostream_screen = TRUE;
+bool ostream_script = FALSE;
+bool ostream_memory = FALSE;
+bool ostream_record = FALSE;
+bool istream_replay = FALSE;
+bool message = FALSE;
+
+/* Current window and mouse data */
+
+int cwin = 0;
+int mwin = 0;
+
+int mouse_y = 0;
+int mouse_x = 0;
+
+/* Window attributes */
+
+bool enable_wrapping = FALSE;
+bool enable_scripting = TRUE;
+bool enable_scrolling = FALSE;
+bool enable_buffering = FALSE;
+
+/* User options */
+
+/*
+int option_attribute_assignment = 0;
+int option_attribute_testing = 0;
+int option_context_lines = 0;
+int option_object_locating = 0;
+int option_object_movement = 0;
+int option_left_margin = 0;
+int option_right_margin = 0;
+int option_ignore_errors = 0;
+int option_piracy = 0;
+int option_undo_slots = MAX_UNDO_SLOTS;
+int option_expand_abbreviations = 0;
+int option_script_cols = 80;
+int option_save_quetzal = 1;
+*/
+
+int option_sound = 1;
+char *option_zcode_path;
+
+
+/* Size of memory to reserve (in bytes) */
+
+long reserve_mem = 0;
+
+/*
+ * z_piracy, branch if the story file is a legal copy.
+ *
+ *	no zargs used
+ *
+ */
+
+void z_piracy (void)
+{
+
+    branch (!f_setup.piracy);
+
+}/* z_piracy */
+
+/*
+ * main
+ *
+ * Prepare and run the game.
+ *
+ */
+
+#include "glk.h"
+#include "glkstart.h"
+
+static int myargc;
+static char **myargv;
+
+glkunix_argumentlist_t glkunix_arguments[] =
+{
+{ "-a", glkunix_arg_NoValue, "-a: watch attribute setting" },
+{ "-A", glkunix_arg_NoValue, "-A: watch attribute testing" },
+{ "-i", glkunix_arg_NoValue, "-i: ignore fatal errors" },
+{ "-o", glkunix_arg_NoValue, "-o: watch object movement" },
+{ "-O", glkunix_arg_NoValue, "-O: watch object locating" },
+{ "-P", glkunix_arg_NoValue, "-P: alter piracy opcode" },
+{ "-Q", glkunix_arg_NoValue, "-Q: use old-style save format" },
+{ "-t", glkunix_arg_NoValue, "-t: set Tandy bit" },
+{ "-x", glkunix_arg_NoValue, "-x: expand abbreviations g/x/z" },
+{ "-I", glkunix_arg_NumberValue, "-I: interpreter number" },
+{ "-s", glkunix_arg_NumberValue, "-s: random number seed value" },
+{ "-S", glkunix_arg_NumberValue, "-S: transcript width" },
+{ "-u", glkunix_arg_NumberValue, "-u: slots for multiple undo" },
+{ "-Z", glkunix_arg_NumberValue, "-Z: error checking mode" },
+{ "", glkunix_arg_ValueFollows, "filename: The game file to load." },
+{ NULL, glkunix_arg_End, NULL }
+};
+
+int glkunix_startup_code(glkunix_startup_t *data)
+{
+	myargc = data->argc;
+	myargv = data->argv;
+
+    os_init_setup ();
+    os_process_arguments (myargc, myargv);
+
+    init_buffer ();
+    init_err ();
+    init_memory ();
+    init_process ();
+    init_sound ();
+
+    os_init_screen ();
+
+    init_undo ();
+    z_restart ();
+    return TRUE;
+}
+
+void glk_main (void)
+{
+    interpret ();
+    reset_memory ();
+}
+