--- a/blastem.c	Tue Feb 18 20:32:10 2014 -0800
+++ b/blastem.c	Tue Feb 18 21:37:31 2014 -0800
@@ -182,6 +182,7 @@
 
 void sync_z80(z80_context * z_context, uint32_t mclks)
 {
+#ifdef X86_64
 	if (z80_enabled && !reset && !busreq) {
 		genesis_context * gen = z_context->system;
 		z_context->sync_cycle = mclks / MCLKS_PER_Z80;
@@ -201,7 +202,9 @@
 				dprintf("Z80 ran to cycle %d\n", z_context->current_cycle);
 			}
 		}
-	} else {
+	} else
+#endif
+	{
 		z_context->current_cycle = mclks / MCLKS_PER_Z80;
 	}
 }
@@ -469,7 +472,9 @@
 			location &= 0x7FFF;
 			if (location < 0x4000) {
 				z80_ram[location & 0x1FFF] = value;
+#ifdef X86_64
 				z80_handle_code_write(location & 0x1FFF, gen->z80);
+#endif
 			} else if (location < 0x6000) {
 				sync_sound(gen, context->current_cycle * MCLKS_PER_68K);
 				if (location & 1) {
@@ -986,7 +991,9 @@
 			insert_breakpoint(&context, pc, debugger);
 		}
 		adjust_int_cycle(gen->m68k, gen->vdp);
+#ifdef X86_64
 		gen->z80->native_pc =  z80_get_native_address_trans(gen->z80, gen->z80->pc);
+#endif
 		start_68k_context(&context, pc);
 	} else {
 		if (debugger) {
@@ -1231,8 +1238,10 @@
 
 	z80_context z_context;
 	x86_z80_options z_opts;
+#ifdef X86_64
 	init_x86_z80_opts(&z_opts);
 	init_z80_context(&z_context, &z_opts);
+#endif
 
 	z_context.system = &gen;
 	z_context.mem_pointers[0] = z80_ram;