--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test.c	Sun Jul 26 16:51:03 2015 -0700
@@ -0,0 +1,76 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "vdp.h"
+
+int headless = 1;
+uint16_t read_dma_value(uint32_t address)
+{
+	return 0;
+}
+
+uint32_t render_map_color(uint8_t r, uint8_t g, uint8_t b)
+{
+	return 0;
+}
+
+void render_alloc_surfaces(vdp_context * context)
+{
+	context->oddbuf = context->framebuf = malloc(512 * 256 * 4 * 2);
+	memset(context->oddbuf, 0, 512 * 256 * 4 * 2);
+	context->evenbuf = ((char *)context->oddbuf) + 512 * 256 * 4;
+}
+
+int check_hint_time(vdp_context * v_context)
+{
+	uint32_t orig_hint_cycle = vdp_next_hint(v_context);
+	uint32_t cur_hint_cycle;
+	printf("hint cycle is %d at vcounter: %d, hslot: %d\n", orig_hint_cycle, v_context->vcounter, v_context->hslot);
+	int res = 1;
+	while ((cur_hint_cycle = vdp_next_hint(v_context)) > v_context->cycles)
+	{
+		if (cur_hint_cycle != orig_hint_cycle) {
+			fprintf(stderr, "ERROR: hint cycle changed to %d at vcounter: %d, hslot: %d\n", cur_hint_cycle, v_context->vcounter, v_context->hslot);
+			orig_hint_cycle = cur_hint_cycle;
+			res = 0;
+		}
+		vdp_run_context(v_context, v_context->cycles + 1);
+	}
+	printf("hint fired at cycle: %d, vcounter: %d, hslot: %d\n", cur_hint_cycle, v_context->vcounter, v_context->hslot);
+	vdp_int_ack(v_context, 4);
+	return res;
+}
+
+
+int main(int argc, char ** argv)
+{
+	vdp_context v_context;
+	init_vdp_context(&v_context, 0);
+	vdp_control_port_write(&v_context, 0x8144);
+	vdp_control_port_write(&v_context, 0x8C81);
+	vdp_control_port_write(&v_context, 0x8A7F);
+	vdp_control_port_write(&v_context, 0x8014);
+	v_context.hint_counter = 0x7F;
+	v_context.vcounter = 128;
+	v_context.hslot = 165;
+	//check single shot behavior
+	int res = check_hint_time(&v_context);
+	//check every line behavior
+	while (v_context.vcounter < 225)
+	{
+		vdp_run_context(&v_context, v_context.cycles + 1);
+	}
+	vdp_control_port_write(&v_context, 0x8A00);
+	int hint_count = 0;
+	while (res && v_context.vcounter != 224)
+	{
+		res = res && check_hint_time(&v_context);
+		hint_count++;
+	}
+	if (res && hint_count != 225) {
+		fprintf(stderr, "ERROR: hint count should be 225 but was %d instead\n", hint_count);
+		res = 0;
+	}
+	return 0;
+}