Merge pull request #77 from ARoxdale/master

SMS mode memory fix

libretro/libretro.c

@@ -2136,8 +2136,12 @@ void *retro_get_memory_data(unsigned id)
       case RETRO_MEMORY_SAVE_RAM:
          return sram.sram;
       case RETRO_MEMORY_SYSTEM_RAM:
-         return work_ram;
 
+      if (system_hw == SYSTEM_SMS)
+	return zram; // 0x2000 = 8kb z80 ram
+      else
+	return work_ram; //0x10000 = 64kb 68000 ram
+	
       default:
          return NULL;
    }