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diff --git a/src/scheme/tiny-test/ao_scheme_os.h b/src/scheme/tiny-test/ao_scheme_os.h
new file mode 100644
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--- /dev/null
+++ b/src/scheme/tiny-test/ao_scheme_os.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef _AO_SCHEME_OS_H_
+#define _AO_SCHEME_OS_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#undef AO_SCHEME_FEATURE_FLOAT
+#undef AO_SCHEME_FEATURE_VECTOR
+#undef AO_SCHEME_FEATURE_QUASI
+#undef AO_SCHEME_FEATURE_BIGINT
+
+#define AO_SCHEME_POOL_TOTAL	4096
+#define AO_SCHEME_SAVE		1
+
+extern int ao_scheme_getc(void);
+
+static inline void
+ao_scheme_os_flush() {
+	fflush(stdout);
+}
+
+static inline void
+ao_scheme_abort(void)
+{
+	abort();
+}
+
+static inline void
+ao_scheme_os_led(int led)
+{
+	printf("leds set to 0x%x\n", led);
+}
+
+#define AO_SCHEME_JIFFIES_PER_SECOND	100
+
+static inline void
+ao_scheme_os_delay(int jiffies)
+{
+	struct timespec ts = {
+		.tv_sec = jiffies / AO_SCHEME_JIFFIES_PER_SECOND,
+		.tv_nsec = (jiffies % AO_SCHEME_JIFFIES_PER_SECOND) * (1000000000L / AO_SCHEME_JIFFIES_PER_SECOND)
+	};
+	nanosleep(&ts, NULL);
+}
+
+static inline int
+ao_scheme_os_jiffy(void)
+{
+	struct timespec tp;
+	clock_gettime(CLOCK_MONOTONIC, &tp);
+	return tp.tv_sec * AO_SCHEME_JIFFIES_PER_SECOND + (tp.tv_nsec / (1000000000L / AO_SCHEME_JIFFIES_PER_SECOND));
+}
+
+#endif