diff --git a/desmume/src/addons/slot1_retail_nand.cpp b/desmume/src/addons/slot1_retail_nand.cpp
index 0c81daa36..7c9d9426b 100644
--- a/desmume/src/addons/slot1_retail_nand.cpp
+++ b/desmume/src/addons/slot1_retail_nand.cpp
@@ -93,10 +93,10 @@ public:
 		{
 			case eSlot1Operation_00_ReadHeader_Unencrypted:
 				protocol.address = (protocol.command.bytes[1] << 24) | (protocol.command.bytes[2] << 16) | (protocol.command.bytes[3] << 8) | protocol.command.bytes[4];
+				rom.start(operation,protocol.address);
 				break;
 
-			//case eSlot1Operation_B7_Read: 
-				//???
+			//case eSlot1Operation_B7_Read:  //zero 15-sep-2014 - this was removed during epoch of addon re-engineering to fix a bug
 
 			case eSlot1Operation_2x_SecureAreaLoad:
 				//don't re-generate address here. it was already done, according to different rules, for this operation
diff --git a/desmume/src/addons/slot1comp_protocol.cpp b/desmume/src/addons/slot1comp_protocol.cpp
index 9ca30418a..80dc67e35 100644
--- a/desmume/src/addons/slot1comp_protocol.cpp
+++ b/desmume/src/addons/slot1comp_protocol.cpp
@@ -89,6 +89,7 @@ void Slot1Comp_Protocol::write_command_KEY1(GC_Command command)
 			delay = 0x910, length = 4;
 			//we handle this operation ourselves
 			break;
+
 		case 0x20:
 			operation = eSlot1Operation_2x_SecureAreaLoad;
 			delay = 0x910, length = 0x11A8;
@@ -101,20 +102,25 @@ void Slot1Comp_Protocol::write_command_KEY1(GC_Command command)
 				u64 cmd64 = *(u64*)command.bytes;
 #endif
 				//todo - parse into blocknumber
-				address = (u32)((cmd64 >> 32) & 0xF000);
+				u32 blocknumber = (cmd64>>44)&0xFFFF;
+				if(blocknumber<4||blocknumber>7)
+					printf("SLOT1 WARNING: INVALID BLOCKNUMBER FOR \"Get Secure Area Block\": 0x%04X\n",blocknumber);
+				address = blocknumber*0x1000;
 			}
 			client->slot1client_startOperation(operation);
-
 			break;
+
 		case 0x40:
 			//switch to KEY2
 			delay = 0x910, length = 0; 
 			//well.. not really... yet.
 			GCLOG("[GC] KEY2 ACTIVATED\n");
 			break;
+
 		case 0x60:
 			//KEY2 disable? any info?
 			break;
+
 		case 0xA0:
 			delay = 0x910, length = 0;
 			mode = eCardMode_NORMAL;
diff --git a/desmume/src/addons/slot1comp_rom.cpp b/desmume/src/addons/slot1comp_rom.cpp
index 50415d9c1..bc72ca804 100644
--- a/desmume/src/addons/slot1comp_rom.cpp
+++ b/desmume/src/addons/slot1comp_rom.cpp
@@ -41,7 +41,10 @@ u32 Slot1Comp_Rom::read()
 	case eSlot1Operation_2x_SecureAreaLoad:
 		{
 			//see B7 for details
-			address &= gameInfo.mask; //sanity check
+
+			//zero 15-sep-2014 - this is meaningless. newer mask is actually reasonable
+			//address &= gameInfo.mask; //sanity check 
+			address &= 0x3FFF; //memory safe sanity test
 			u32 ret = LE_TO_LOCAL_32(*(u32*)(gameInfo.secureArea + (address - 0x4000)));
 			address = (address&~0xFFF) + ((address+4)&0xFFF);
 			return ret;