change backupmem autodetection to catch more cases of unusual usage patterns

desmume/ChangeLog

@@ -20,6 +20,7 @@
  - Add functions for a lid open/close. Holding key (default "Backspace" in Windows port) while game is freeze/non freeze. [CrazyMax]
  - Added a bunch of crazy templates to the cpu and mmu for minor speed boosts [zeromus]
  - Add secure area decryption from ndstool [zeromus]
+ - change backupmem autodetection to catch more cases of unusual usage patterns [zeromus]
  Graphics:
  - Added gfx3d module which emulates the whole GE as part of the core emu. [zeromus]
  - Moved the windows/cocoa OGLRender to the emu core and replace ogl_collector. 

desmume/src/mc.cpp

@@ -145,7 +145,8 @@ void mc_reset_com(memory_chip_t *mc)
          mc->type = MC_TYPE_EEPROM2;
          mc->size = MC_SIZE_64KBITS;
       }
-      else if (mc->autodetectsize == (16+1))
+	  //if it writes a funny number less than 4kbits, then assume it is 4kbit eeprom
+      else if (mc->autodetectsize <= (16+1))
       {
          // 4 Kbit EEPROM
          addr = mc->autodetectbuf[0];
@@ -163,6 +164,8 @@ void mc_reset_com(memory_chip_t *mc)
          mc->type = MC_TYPE_FLASH;
          mc->size = MC_SIZE_2MBITS;
 		 */
+
+		  //otherwise, we hope it must be a 64kbits eeprom
 	 // 64 Kbit EEPROM
          addr = (mc->autodetectbuf[0] << 8) | mc->autodetectbuf[1];
          mc->type = MC_TYPE_EEPROM2;