diff --git a/lib/LinkCard.hpp b/lib/LinkCard.hpp
index c665116..4eb77f5 100644
--- a/lib/LinkCard.hpp
+++ b/lib/LinkCard.hpp
@@ -79,10 +79,9 @@ class LinkCard {
   static constexpr int EREADER_SIO_END = 0xF3F3;
   static constexpr int EREADER_CANCEL = 0xF7F7;
   static constexpr int CMD_LINKCARD_RESET = 0;
-  static constexpr int SLAVE_HIGH_WAIT = 228;
-  static constexpr int SLAVE_LOW_WAIT = 5;
+  static constexpr int MODE_SWITCH_WAIT = 228;
   static constexpr int DEACTIVATION_WAIT = 50;
-  static constexpr int PRE_TRANSFER_WAIT = 2;
+  static constexpr int PRE_TRANSFER_WAIT = 2 + 1;
 
  public:
   enum class SendResult {
@@ -184,7 +183,7 @@ class LinkCard {
       linkRawCable.activate();
       auto guard = Link::ScopeGuard([&]() { disableMulti(); });
 
-      Link::wait(SLAVE_HIGH_WAIT);
+      Link::wait(MODE_SWITCH_WAIT);
       if (cancel())
         return SendResult::CANCELED;
 
@@ -205,7 +204,7 @@ class LinkCard {
       linkSPI.activate(LinkSPI::Mode::MASTER_256KBPS);
       auto guard = Link::ScopeGuard([&]() { disableNormal(); });
 
-      Link::wait(SLAVE_HIGH_WAIT);
+      Link::wait(MODE_SWITCH_WAIT);
       if (cancel())
         return SendResult::CANCELED;
 
@@ -229,7 +228,7 @@ class LinkCard {
       linkRawCable.activate();
       auto guard = Link::ScopeGuard([&]() { disableMulti(); });
 
-      Link::wait(SLAVE_HIGH_WAIT);
+      Link::wait(MODE_SWITCH_WAIT);
       if (cancel())
         return SendResult::CANCELED;
 
@@ -268,8 +267,6 @@ class LinkCard {
     if (!transferMultiAndExpect(HANDSHAKE_RECV_3, HANDSHAKE_RECV_3, cancel))
       return ReceiveResult::CANCELED;
 
-    Link::wait(SLAVE_HIGH_WAIT);
-
     // card request
     if (!transferMultiAndExpect(GAME_REQUEST, HANDSHAKE_RECV_3, cancel))
       return ReceiveResult::CANCELED;
@@ -291,9 +288,8 @@ class LinkCard {
     }
 
     // start signal
-    if (transferMulti(GAME_RECEIVE_READY, cancel) != EREADER_SEND_READY)
-      return ReceiveResult::UNEXPECTED_FAILURE;
-    Link::wait(SLAVE_HIGH_WAIT);
+    if (!transferMultiAndExpect(GAME_RECEIVE_READY, EREADER_SEND_READY, cancel))
+      return ReceiveResult::CANCELED;
     if (!transferMultiAndExpect(GAME_RECEIVE_READY, EREADER_SEND_START, cancel))
       return ReceiveResult::CANCELED;
 
@@ -307,16 +303,13 @@ class LinkCard {
       card[i] = Link::lsB16(block);
       card[i + 1] = Link::msB16(block);
       checksum += block;
-      Link::wait(SLAVE_LOW_WAIT);
     }
 
     // checksum
     if (transferMulti(GAME_RECEIVE_READY, cancel) != Link::lsB32(checksum))
       return ReceiveResult::BAD_CHECKSUM;
-    Link::wait(SLAVE_LOW_WAIT);
     if (transferMulti(GAME_RECEIVE_READY, cancel) != Link::msB32(checksum))
       return ReceiveResult::BAD_CHECKSUM;
-    Link::wait(SLAVE_LOW_WAIT);
 
     // end
     if (transferMulti(GAME_RECEIVE_READY, cancel) != EREADER_SEND_END)