--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main.c	Tue Mar 22 22:44:02 2016 -0700
@@ -0,0 +1,74 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cpu.h"
+
+#define CYCLES_PER_FRAME ((48000*25)/60)
+
+uint8_t rom[48 * 1024];
+uint8_t ram[16 * 1024];
+
+enum {
+	PORT_CONTROLLER_1,
+	PORT_CONTROLLER_2,
+	PORT_CONTROLLER_3,
+	PORT_CONTROLLER_4,
+	PORT_FREQUENCY_A,
+	PORT_FREQUENCY_B,
+	PORT_FREQUENCY_C,
+	PORT_FREQUENCY_D,
+	PORT_VOLUME_AB,
+	PORT_VOLUME_CD,
+	PORT_TIMER,
+	PORT_SERIAL,
+};
+
+void debug_port_write(cpu *context, uint8_t port, uint16_t value)
+{
+	putchar(value);
+}
+
+uint16_t debug_port_read(cpu *context, uint8_t port)
+{
+	return getchar();
+}
+
+memory_region regions[] = {
+	{rom, 0, sizeof(rom)-1, MEM_READ},
+	{ram, sizeof(rom), sizeof(rom)-1+sizeof(ram), MEM_READ},
+};
+
+void run_console(cpu *context)
+{
+	for(;;)
+	{
+		run_cpu(context, CYCLES_PER_FRAME);
+		context->cycles -= CYCLES_PER_FRAME;
+	}
+}
+
+
+
+int main(int argc, char **argv)
+{
+	if (argc < 2) {
+		fputs("usage: s16 FILE\n", stderr);
+		return 1;
+	}
+	FILE *f = fopen(argv[1], "rb");
+	if (!f) {
+		fprintf(stderr, "Failed to open %s for reading\n", argv[1]);
+		return 1;
+	}
+	
+	size_t read;
+	if ((read = fread(rom, 1, sizeof(rom), f)) < sizeof(rom))  {
+		memset(rom + read, 0xFF, sizeof(rom)-read);
+	}
+	cpu *context = alloc_cpu(1, sizeof(regions)/sizeof(memory_region), regions);
+	context->port_handlers[PORT_SERIAL].write = debug_port_write;
+	context->port_handlers[PORT_SERIAL].read = debug_port_read;
+	run_console(context);
+	return 0;
+}