--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testgst.c	Fri Jul 26 19:55:04 2013 -0700
@@ -0,0 +1,78 @@
+#include "gst.h"
+#include <string.h>
+#include <stdlib.h>
+
+uint8_t busreq;
+uint8_t reset;
+
+int32_t color_map[1 << 12];
+
+void latch_mode(vdp_context * context)
+{
+}
+void ym_data_write(ym2612_context * context, uint8_t value)
+{
+	if (context->selected_reg >= YM_REG_END) {
+		return;
+	}
+	if (context->selected_part) {
+		if (context->selected_reg < YM_PART2_START) {
+			return;
+		}
+		context->part2_regs[context->selected_reg - YM_PART2_START] = value;
+	} else {
+		if (context->selected_reg < YM_PART1_START) {
+			return;
+		}
+		context->part1_regs[context->selected_reg - YM_PART1_START] = value;
+	}
+}
+
+void ym_address_write_part1(ym2612_context * context, uint8_t address)
+{
+	//printf("address_write_part1: %X\n", address);
+	context->selected_reg = address;
+	context->selected_part = 0;
+}
+
+void ym_address_write_part2(ym2612_context * context, uint8_t address)
+{
+	//printf("address_write_part2: %X\n", address);
+	context->selected_reg = address;
+	context->selected_part = 1;
+}
+
+uint16_t ram[64*1024];
+uint8_t zram[8*1024];
+
+
+int main(int argc, char ** argv)
+{
+	vdp_context vdp;
+	ym2612_context ym;
+	psg_context psg;
+	m68k_context m68k;
+	z80_context z80;
+	genesis_context gen;
+	if (argc < 3) {
+		fputs("Usage: testgst infile outfile\n", stderr);
+		return 1;
+	}
+	memset(&gen, 0, sizeof(gen));
+	memset(&m68k, 0, sizeof(m68k));
+	memset(&z80, 0, sizeof(z80));
+	memset(&ym, 0, sizeof(ym));
+	memset(&vdp, 0, sizeof(vdp));
+	memset(&psg, 0, sizeof(psg));
+	m68k.mem_pointers[1] = ram;
+	z80.mem_pointers[0] = zram;
+	vdp.vdpmem = malloc(VRAM_SIZE);
+	gen.vdp = &vdp;
+	gen.ym = &ym;
+	gen.psg = &psg;
+	gen.m68k = &m68k;
+	gen.z80 = &z80;
+	uint32_t pc = load_gst(&gen, argv[1]);
+	save_gst(&gen, argv[2], pc);
+	return 0;
+}