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diff --git a/interpreters/bocfel/unicode.h b/interpreters/bocfel/unicode.h
new file mode 100644
index 0000000..b421fef
--- /dev/null
+++ b/interpreters/bocfel/unicode.h
@@ -0,0 +1,44 @@
+#ifndef ZTERP_TABLES_H
+#define ZTERP_TABLES_H
+
+#include <stdint.h>
+
+#ifdef ZTERP_GLK
+#include <glk.h>
+#endif
+
+#define UNICODE_LINEFEED	10
+#define UNICODE_SPACE		32
+#define UNICODE_QUESTIONMARK	63
+
+#define ZSCII_NEWLINE		13
+#define ZSCII_SPACE		32
+#define ZSCII_QUESTIONMARK	63
+
+/* This variable controls whether Unicode is used for screen
+ * output.  This affects @check_unicode as well as the ZSCII to
+ * Unicode table.  With Glk it is set based on whether the Glk
+ * implementation supports Unicode (checked with the Unicode
+ * gestalt), and determines whether Unicode IO functions should
+ * be used; otherwise, it is kept in parallel with use_utf8_io.
+ */
+extern int have_unicode;
+
+extern uint16_t zscii_to_unicode[];
+extern uint8_t unicode_to_zscii[];
+extern uint8_t unicode_to_zscii_q[];
+extern uint8_t unicode_to_latin1[];
+extern uint16_t zscii_to_font3[];
+extern int atable_pos[];
+
+void parse_unicode_table(uint16_t);
+void setup_tables(void);
+
+uint16_t unicode_tolower(uint16_t);
+
+/* Standard 1.1 notes that Unicode characters 0–31 and 127–159
+ * are invalid due to the fact that they’re control codes.
+ */
+static inline int valid_unicode(uint16_t c) { return (c >= 32 && c <= 126) || c >= 160; }
+
+#endif