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diff --git a/src/core/ao_host.h b/src/core/ao_host.h
new file mode 100644
index 00000000..65c25fe5
--- /dev/null
+++ b/src/core/ao_host.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright © 2009 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.
+ */
+
+#define _GNU_SOURCE
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define AO_ADC_RING	64
+#define ao_adc_ring_next(n)	(((n) + 1) & (AO_ADC_RING - 1))
+#define ao_adc_ring_prev(n)	(((n) - 1) & (AO_ADC_RING - 1))
+
+/*
+ * One set of samples read from the A/D converter
+ */
+struct ao_adc {
+	uint16_t	tick;		/* tick when the sample was read */
+	int16_t		accel;		/* accelerometer */
+	int16_t		pres;		/* pressure sensor */
+	int16_t		temp;		/* temperature sensor */
+	int16_t		v_batt;		/* battery voltage */
+	int16_t		sense_d;	/* drogue continuity sense */
+	int16_t		sense_m;	/* main continuity sense */
+};
+
+#define __pdata
+#define __data
+#define __xdata
+#define __code
+#define __reentrant
+
+enum ao_flight_state {
+	ao_flight_startup = 0,
+	ao_flight_idle = 1,
+	ao_flight_pad = 2,
+	ao_flight_boost = 3,
+	ao_flight_fast = 4,
+	ao_flight_coast = 5,
+	ao_flight_drogue = 6,
+	ao_flight_main = 7,
+	ao_flight_landed = 8,
+	ao_flight_invalid = 9
+};
+
+struct ao_adc ao_adc_ring[AO_ADC_RING];
+uint8_t ao_adc_head;
+
+#define ao_led_on(l)
+#define ao_led_off(l)
+#define ao_timer_set_adc_interval(i)
+#define ao_wakeup(wchan) ao_dump_state(wchan)
+#define ao_cmd_register(c)
+#define ao_usb_disable()
+#define ao_telemetry_set_interval(x)
+#define ao_delay(x)
+
+enum ao_igniter {
+	ao_igniter_drogue = 0,
+	ao_igniter_main = 1
+};
+
+void
+ao_ignite(enum ao_igniter igniter)
+{
+	printf ("ignite %s\n", igniter == ao_igniter_drogue ? "drogue" : "main");
+}
+
+struct ao_task {
+	int dummy;
+};
+
+#define ao_add_task(t,f,n)
+
+#define ao_log_start()
+#define ao_log_stop()
+
+#define AO_MS_TO_TICKS(ms)	((ms) / 10)
+#define AO_SEC_TO_TICKS(s)	((s) * 100)
+
+#define AO_FLIGHT_TEST
+
+struct ao_adc ao_adc_static;
+
+FILE *emulator_in;
+
+void
+ao_dump_state(void *wchan);
+
+void
+ao_sleep(void *wchan);
+
+const char const * const ao_state_names[] = {
+	"startup", "idle", "pad", "boost", "fast",
+	"coast", "drogue", "main", "landed", "invalid"
+};
+
+struct ao_cmds {
+	void		(*func)(void);
+	const char	*help;
+};
+
+
+struct ao_config {
+	uint16_t	main_deploy;
+	int16_t		accel_zero_g;
+};
+
+#define ao_config_get()
+
+struct ao_config ao_config = { 250, 16000 };