Moved the MR Intel Advanced/ATX to the Dev branch.

src/rom.c

@@ -13,7 +13,7 @@
  *		- c386sx16 BIOS fails checksum
  *		- the loadfont() calls should be done elsewhere
  *
- * Version:	@(#)rom.c	1.0.34	2018/03/02
+ * Version:	@(#)rom.c	1.0.35	2018/03/06
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -848,12 +848,14 @@ rom_load_bios(int rom_id)
 		biosmask = 0x1ffff;
 		return(1);
 
+#if defined(DEV_BRANCH) && defined(USE_MRTHOR)
 	case ROM_MRTHOR:
 		if (! rom_load_linear(
 			L"roms/machines/mrthor/mr_atx.bio",
 			0x000000, 131072, 0, rom)) break;
 		biosmask = 0x1ffff;
 		return(1);
+#endif
 
 	case ROM_ZAPPA:
 		if (! rom_load_linear(