diff --git a/src/sys/mako.cpp b/src/sys/mako.cpp
index 689984b..6cbca1b 100644
--- a/src/sys/mako.cpp
+++ b/src/sys/mako.cpp
@@ -72,7 +72,7 @@ int MAKO::thread(void* pvoid)
 					pparams->mako->load_mda(next_music);
 					pparams->mako->start_midi();
 					current_music = next_music;
-					Sleep(100);
+					SDL_Delay(100);
 				} else {
 					next_music = 0;
 				}
@@ -86,7 +86,7 @@ int MAKO::thread(void* pvoid)
 		if(pparams->next_music == next_music_bak) {
 			pparams->next_music = next_music;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// MIDI開放
diff --git a/src/sys/mako.h b/src/sys/mako.h
index 5a58a54..f1308cf 100644
--- a/src/sys/mako.h
+++ b/src/sys/mako.h
@@ -98,7 +98,7 @@ private:
 	PLAY play[9];
 	bool mute_flag;
 	float play_time;
-	DWORD prev_time;
+	Uint32 prev_time;
 
 public:
 	MAKO(NACT* parent);
diff --git a/src/sys/mako_midi.cpp b/src/sys/mako_midi.cpp
index 170a521..d2fe1c5 100644
--- a/src/sys/mako_midi.cpp
+++ b/src/sys/mako_midi.cpp
@@ -92,7 +92,7 @@ void MAKO::start_midi()
 	midiOutPrepareHeader(hMidi, &mhMidi, sizeof(mhMidi));
 	midiOutLongMsg(hMidi, &mhMidi, sizeof(mhMidi));
 	while(!(mhMidi.dwFlags & MHDR_DONE)) {
-		Sleep(10);
+		SDL_Delay(10);
 	}
 	midiOutUnprepareHeader(hMidi, &mhMidi, sizeof(mhMidi));
 
@@ -123,14 +123,14 @@ void MAKO::start_midi()
 	}
 
 	// タイマーリセット
-	prev_time = timeGetTime();
+	prev_time = SDL_GetTicks();
 	play_time = 0;
 }
 
 void MAKO::play_midi()
 {
 	// 経過時間の取得
-	DWORD current_time = timeGetTime();
+	Uint32 current_time = SDL_GetTicks();
 	if(current_time > prev_time) {
 		play_time += (float)(current_time - prev_time);
 		prev_time = current_time;
diff --git a/src/sys/nact.cpp b/src/sys/nact.cpp
index 4193f32..87c5220 100644
--- a/src/sys/nact.cpp
+++ b/src/sys/nact.cpp
@@ -85,7 +85,7 @@ NACT::NACT()
 	// コマンド初期化
 	column = true;		// 座標モード
 	wait_keydown = true;	// ウェイト時のキー受付
-	seed = timeGetTime();	// 乱数の種
+	seed = SDL_GetTicks();	// 乱数の種
 	text_wait_time = 100;	// メッセージ表示のウェイト
 	text_wait_enb = false;
 	text_skip_enb = false;
@@ -172,9 +172,9 @@ int NACT::thread(void* pvoid)
 		pparams->nact->execute();
 		// 512コマンド実行毎にSleep(10)
 		if(!(sleep_cnt = (sleep_cnt + 1) & 0x1ff)) {
-			Sleep(10);
+			SDL_Delay(10);
 		} else {
-			Sleep(0);
+			SDL_Delay(0);
 		}
 	}
 	return 0;
@@ -341,7 +341,7 @@ void NACT::execute()
 #endif
 				
 				if(!ags->draw_menu && text_wait_enb && cmd != 0x20) {
-					DWORD dwTime = timeGetTime() + text_wait_time;
+					Uint32 dwTime = SDL_GetTicks() + text_wait_time;
 					for(;;) {
 						if(params.terminate) {
 							return;
@@ -350,10 +350,10 @@ void NACT::execute()
 						if(RND && wait_keydown) {
 							break;
 						}
-						if(dwTime <= timeGetTime()) {
+						if(dwTime <= SDL_GetTicks()) {
 							break;
 						}
-						Sleep(10);
+						SDL_Delay(10);
 					}
 				}
 
@@ -374,7 +374,7 @@ void NACT::execute()
 #endif
 				
 				if(!ags->draw_menu && text_wait_enb) {
-					DWORD dwTime = timeGetTime() + text_wait_time;
+					Uint32 dwTime = SDL_GetTicks() + text_wait_time;
 					for(;;) {
 						if(params.terminate) {
 							return;
@@ -383,10 +383,10 @@ void NACT::execute()
 						if(RND && wait_keydown) {
 							break;
 						}
-						if(dwTime <= timeGetTime()) {
+						if(dwTime <= SDL_GetTicks()) {
 							break;
 						}
-						Sleep(10);
+						SDL_Delay(10);
 					}
 				}
 
diff --git a/src/sys/nact_sys1.cpp b/src/sys/nact_sys1.cpp
index 1e0e1bf..66f7eda 100644
--- a/src/sys/nact_sys1.cpp
+++ b/src/sys/nact_sys1.cpp
@@ -26,21 +26,21 @@
 
 #define WAIT(tm) \
 { \
-	DWORD dwTime = timeGetTime() + (tm); \
+	Uint32 dwTime = SDL_GetTicks() + (tm); \
 	for(;;) { \
 		if(params.terminate) { \
 			return; \
 		} \
-		if(dwTime <= timeGetTime()) { \
+		if(dwTime <= SDL_GetTicks()) { \
 			break; \
 		} \
-		Sleep(10); \
+		SDL_Delay(10); \
 	} \
 }
 
 #define WAIT_KEYQUIT(tm) \
 { \
-	DWORD dwTime = timeGetTime() + (tm); \
+	Uint32 dwTime = SDL_GetTicks() + (tm); \
 	for(;;) { \
 		if(params.terminate) { \
 			return; \
@@ -53,17 +53,17 @@
 				if(!get_key()) { \
 					break; \
 				} \
-				if(dwTime <= timeGetTime()) { \
+				if(dwTime <= SDL_GetTicks()) { \
 					break; \
 				} \
-				Sleep(10); \
+				SDL_Delay(10); \
 			} \
 			break; \
 		} \
-		if(dwTime <= timeGetTime()) { \
+		if(dwTime <= SDL_GetTicks()) { \
 			break; \
 		} \
-		Sleep(10); \
+		SDL_Delay(10); \
 	} \
 }
 
@@ -345,7 +345,7 @@ void NACT::cmd_open_menu()
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -370,14 +370,14 @@ void NACT::cmd_open_menu()
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -387,7 +387,7 @@ void NACT::cmd_open_menu()
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -549,7 +549,7 @@ top2:
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -574,14 +574,14 @@ top2:
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -591,7 +591,7 @@ top2:
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -737,7 +737,7 @@ top2:
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -762,14 +762,14 @@ top2:
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -779,7 +779,7 @@ top2:
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -847,9 +847,9 @@ void NACT::cmd_a()
 			if(get_key()) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
-		Sleep(100);
+		SDL_Delay(100);
 		for(;;) {
 			if(params.terminate) {
 				return;
@@ -857,7 +857,7 @@ void NACT::cmd_a()
 			if(!(get_key() & 0x18)) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 	}
 
@@ -1390,9 +1390,9 @@ void NACT::cmd_y()
 				if(get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
-			Sleep(100);
+			SDL_Delay(100);
 			for(;;) {
 				if(params.terminate) {
 					return;
@@ -1400,7 +1400,7 @@ void NACT::cmd_y()
 				if(!(get_key() & 0x18)) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 			ags->clear_text_window(text_window, true);
 			break;
diff --git a/src/sys/nact_sys2.cpp b/src/sys/nact_sys2.cpp
index 751c9d9..a2d0873 100644
--- a/src/sys/nact_sys2.cpp
+++ b/src/sys/nact_sys2.cpp
@@ -14,21 +14,21 @@
 
 #define WAIT(tm) \
 { \
-	DWORD dwTime = timeGetTime() + (tm); \
+	Uint32 dwTime = SDL_GetTicks() + (tm); \
 	for(;;) { \
 		if(params.terminate) { \
 			return; \
 		} \
-		if(dwTime <= timeGetTime()) { \
+		if(dwTime <= SDL_GetTicks()) { \
 			break; \
 		} \
-		Sleep(10); \
+		SDL_Delay(10); \
 	} \
 }
 
 #define WAIT_KEYQUIT(tm) \
 { \
-	DWORD dwTime = timeGetTime() + (tm); \
+	Uint32 dwTime = SDL_GetTicks() + (tm); \
 	for(;;) { \
 		if(params.terminate) { \
 			return; \
@@ -41,17 +41,17 @@
 				if(!get_key()) { \
 					break; \
 				} \
-				if(dwTime <= timeGetTime()) { \
+				if(dwTime <= SDL_GetTicks()) { \
 					break; \
 				} \
-				Sleep(10); \
+				SDL_Delay(10); \
 			} \
 			break; \
 		} \
-		if(dwTime <= timeGetTime()) { \
+		if(dwTime <= SDL_GetTicks()) { \
 			break; \
 		} \
-		Sleep(10); \
+		SDL_Delay(10); \
 	} \
 }
 
@@ -370,7 +370,7 @@ void NACT::cmd_open_menu()
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -395,14 +395,14 @@ void NACT::cmd_open_menu()
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -412,7 +412,7 @@ void NACT::cmd_open_menu()
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -539,7 +539,7 @@ void NACT::cmd_open_verb()
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -564,14 +564,14 @@ void NACT::cmd_open_verb()
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -581,7 +581,7 @@ void NACT::cmd_open_verb()
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -683,7 +683,7 @@ void NACT::cmd_open_obj(int verb)
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -708,14 +708,14 @@ void NACT::cmd_open_obj(int verb)
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -725,7 +725,7 @@ void NACT::cmd_open_obj(int verb)
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -791,9 +791,9 @@ void NACT::cmd_a()
 			if(get_key()) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
-		Sleep(100);
+		SDL_Delay(100);
 		for(;;) {
 			if(params.terminate) {
 				return;
@@ -801,7 +801,7 @@ void NACT::cmd_a()
 			if(!(get_key() & 0x18)) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 	}
 
@@ -1434,7 +1434,7 @@ void NACT::cmd_y()
 			break;
 		case 3:
 			{
-				DWORD dwTime = timeGetTime() + param * 1000 / 60;
+				Uint32 dwTime = SDL_GetTicks() + param * 1000 / 60;
 				for(;;) {
 					if(params.terminate) {
 						return;
@@ -1443,10 +1443,10 @@ void NACT::cmd_y()
 //					if(RND && wait_keydown) {
 //						break;
 //					}
-					if(dwTime <= timeGetTime()) {
+					if(dwTime <= SDL_GetTicks()) {
 						break;
 					}
-					Sleep(10);
+					SDL_Delay(10);
 				}
 			}
 			break;
@@ -1473,7 +1473,7 @@ void NACT::cmd_y()
 		case 40:
 		case 42:
 			{
-				DWORD dwStart = timeGetTime();
+				Uint32 dwStart = SDL_GetTicks();
 				for(int i = 0; i < 16; i++) {
 					ags->fade_in(i);
 					DWORD dwTime = dwStart + param * 1000 / 60 * i;
@@ -1481,10 +1481,10 @@ void NACT::cmd_y()
 						if(params.terminate) {
 							return;
 						}
-						if(dwTime <= timeGetTime()) {
+						if(dwTime <= SDL_GetTicks()) {
 							break;
 						}
-						Sleep(0);
+						SDL_Delay(0);
 					}
 				}
 			}
@@ -1492,7 +1492,7 @@ void NACT::cmd_y()
 		case 41:
 		case 43:
 			{
-				DWORD dwStart = timeGetTime();
+				Uint32 dwStart = SDL_GetTicks();
 				for(int i = 0; i < 16; i++) {
 					ags->fade_out(i, (cmd == 41) ? false : true);
 					DWORD dwTime = dwStart + param * 1000 / 60 * i;
@@ -1500,10 +1500,10 @@ void NACT::cmd_y()
 						if(params.terminate) {
 							return;
 						}
-						if(dwTime <= timeGetTime()) {
+						if(dwTime <= SDL_GetTicks()) {
 							break;
 						}
-						Sleep(0);
+						SDL_Delay(0);
 					}
 				}
 			}
diff --git a/src/sys/nact_sys3.cpp b/src/sys/nact_sys3.cpp
index c5b39ee..0186e14 100644
--- a/src/sys/nact_sys3.cpp
+++ b/src/sys/nact_sys3.cpp
@@ -184,7 +184,7 @@ void NACT::cmd_open_menu()
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -209,14 +209,14 @@ void NACT::cmd_open_menu()
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -226,7 +226,7 @@ void NACT::cmd_open_menu()
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -353,7 +353,7 @@ void NACT::cmd_open_verb()
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -378,14 +378,14 @@ void NACT::cmd_open_verb()
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -395,7 +395,7 @@ void NACT::cmd_open_verb()
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -497,7 +497,7 @@ void NACT::cmd_open_obj(int verb)
 		if(!get_key()) {
 			break;
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 
 	// メニュー表示
@@ -522,14 +522,14 @@ void NACT::cmd_open_obj(int verb)
 				return;
 			}
 			if(val = get_key()) {
-				Sleep(100);
+				SDL_Delay(100);
 				break;
 			}
 			get_cursor(&current_mx, &current_my);
 			if(abs(my - current_my) > 3) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 		if(val) {
 			for(;;) {
@@ -539,7 +539,7 @@ void NACT::cmd_open_obj(int verb)
 				if(!get_key()) {
 					break;
 				}
-				Sleep(10);
+				SDL_Delay(10);
 			}
 		}
 
@@ -605,9 +605,9 @@ void NACT::cmd_a()
 			if(get_key()) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
-		Sleep(100);
+		SDL_Delay(100);
 		for(;;) {
 			if(params.terminate) {
 				return;
@@ -615,7 +615,7 @@ void NACT::cmd_a()
 			if(!(get_key() & 0x18)) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 	}
 
@@ -888,7 +888,7 @@ void NACT::cmd_k()
 				return;
 			}
 		}
-		Sleep(10);
+		SDL_Delay(10);
 	}
 	if(cmd != 0 && cmd != 4) {
 		RND = val;
@@ -896,7 +896,7 @@ void NACT::cmd_k()
 
 	// キーが離されるまで待機
 	if(cmd != 1) {
-		Sleep(100);
+		SDL_Delay(100);
 		for(;;) {
 			if(params.terminate) {
 				return;
@@ -904,7 +904,7 @@ void NACT::cmd_k()
 			if(!(val = get_key())) {
 				break;
 			}
-			Sleep(10);
+			SDL_Delay(10);
 		}
 	}
 
@@ -1468,7 +1468,7 @@ void NACT::cmd_y()
 			} else if(param == 10001) {
 				wait_keydown = true;
 			} else {
-				DWORD dwTime = timeGetTime() + param * 1000 / 60;
+				Uint32 dwTime = SDL_GetTicks() + param * 1000 / 60;
 				for(;;) {
 					if(params.terminate) {
 						return;
@@ -1477,10 +1477,10 @@ void NACT::cmd_y()
 					if(RND && wait_keydown) {
 						break;
 					}
-					if(dwTime <= timeGetTime()) {
+					if(dwTime <= SDL_GetTicks()) {
 						break;
 					}
-					Sleep(10);
+					SDL_Delay(10);
 				}
 			}
 			break;
@@ -1568,7 +1568,7 @@ void NACT::cmd_y()
 		case 40:
 		case 42:
 			if(ags->now_fade()) {
-				DWORD dwStart = timeGetTime();
+				Uint32 dwStart = SDL_GetTicks();
 				for(int i = 0; i < 16; i++) {
 					ags->fade_in(i);
 					DWORD dwTime = dwStart + param * 1000 / 60 * i;
@@ -1576,10 +1576,10 @@ void NACT::cmd_y()
 						if(params.terminate) {
 							return;
 						}
-						if(dwTime <= timeGetTime()) {
+						if(dwTime <= SDL_GetTicks()) {
 							break;
 						}
-						Sleep(0);
+						SDL_Delay(0);
 					}
 				}
 				ags->fade_end();
@@ -1589,7 +1589,7 @@ void NACT::cmd_y()
 		case 43:
 			if(!ags->now_fade()) {
 				ags->fade_start();
-				DWORD dwStart = timeGetTime();
+				Uint32 dwStart = SDL_GetTicks();
 				for(int i = 0; i < 16; i++) {
 					ags->fade_out(i, (cmd == 41) ? false : true);
 					DWORD dwTime = dwStart + param * 1000 / 60 * i;
@@ -1597,10 +1597,10 @@ void NACT::cmd_y()
 						if(params.terminate) {
 							return;
 						}
-						if(dwTime <= timeGetTime()) {
+						if(dwTime <= SDL_GetTicks()) {
 							break;
 						}
-						Sleep(0);
+						SDL_Delay(0);
 					}
 				}
 			}
@@ -1639,7 +1639,7 @@ void NACT::cmd_y()
 						if(!get_key()) {
 							break;
 						}
-						Sleep(0);
+						SDL_Delay(0);
 					}
 				}
 			} else if(param == 3) {