Changed the ATC6310BXII SPD init to 0x7 because the board only has 3 RAM slots.

src/machine/m_at_slot1.c

@@ -285,7 +285,7 @@ machine_at_atc6310bxii_init(const machine_t *model)
     device_add(&keyboard_ps2_pci_device);
     device_add(&w83977ef_device);
     device_add(&sst_flash_39sf020_device);
-    spd_register(SPD_TYPE_SDRAM, 0xF, 256);
+    spd_register(SPD_TYPE_SDRAM, 0x7, 256);
 
     return ret;	
 }