diff --git a/Source/automap.cpp b/Source/automap.cpp
index f20077062..37f0151e5 100644
--- a/Source/automap.cpp
+++ b/Source/automap.cpp
@@ -173,7 +173,7 @@ void DrawAutomap()
 		return;
 	}
 
-	gpBufEnd = (unsigned char *)&gpBuffer[(352 + 160) * 768];
+	gpBufEnd = (unsigned char *)&gpBuffer[(VIEWPORT_HEIGHT + 160) * 768];
 
 	MapX = (ViewX - 16) >> 1;
 	while (MapX + AutoMapXOfs < 0)
diff --git a/Source/control.cpp b/Source/control.cpp
index b9567b075..9c2ed89c2 100644
--- a/Source/control.cpp
+++ b/Source/control.cpp
@@ -2092,7 +2092,7 @@ void RedBack()
 			add		edi, SCREENXY(0, 0)
 			mov		ebx, pLightTbl
 			add		ebx, idx
-			mov		edx, 352
+			mov		edx, VIEWPORT_HEIGHT
 		lx_label1:
 			mov		ecx, 640
 		lx_label2:
@@ -2110,7 +2110,7 @@ void RedBack()
 			add		edi, SCREENXY(0, 0)
 			mov		ebx, pLightTbl
 			add		ebx, idx
-			mov		edx, 352
+			mov		edx, VIEWPORT_HEIGHT
 		l4_label1:
 			mov		ecx, 640
 		l4_label2:
@@ -2133,7 +2133,7 @@ void RedBack()
 	if (leveltype != DTYPE_HELL) {
 		dst = &gpBuffer[SCREENXY(0, 0)];
 		tbl = &pLightTbl[idx];
-		for (h = 352; h; h--, dst += 768 - 640) {
+		for (h = VIEWPORT_HEIGHT; h; h--, dst += 768 - 640) {
 			for (w = 640; w; w--) {
 				*dst = tbl[*dst];
 				dst++;
@@ -2142,7 +2142,7 @@ void RedBack()
 	} else {
 		dst = &gpBuffer[SCREENXY(0, 0)];
 		tbl = &pLightTbl[idx];
-		for (h = 352; h; h--, dst += 768 - 640) {
+		for (h = VIEWPORT_HEIGHT; h; h--, dst += 768 - 640) {
 			for (w = 640; w; w--) {
 				if (*dst >= 32)
 					*dst = tbl[*dst];
diff --git a/Source/cursor.cpp b/Source/cursor.cpp
index dc8095d6a..613ea2967 100644
--- a/Source/cursor.cpp
+++ b/Source/cursor.cpp
@@ -190,8 +190,8 @@ void CheckCursMove()
 			sx = 0;
 		}
 	}
-	if(sy > 351 && track_isscrolling()) {
-		sy = 351;
+	if(sy > VIEWPORT_HEIGHT - 1 && track_isscrolling()) {
+		sy = VIEWPORT_HEIGHT - 1;
 	}
 	if(!zoomflag) {
 		sx >>= 1;
@@ -271,7 +271,7 @@ void CheckCursMove()
 		cursmy = my;
 		return;
 	}
-	if(MouseY > 352) {
+	if(MouseY > VIEWPORT_HEIGHT) {
 		CheckPanelInfo();
 		return;
 	}
diff --git a/Source/diablo.cpp b/Source/diablo.cpp
index fe423d1c1..82d5a8282 100644
--- a/Source/diablo.cpp
+++ b/Source/diablo.cpp
@@ -801,7 +801,7 @@ BOOL LeftMouseDown(int wParam)
 				SetSpell();
 			} else if (stextflag) {
 				CheckStoreBtn();
-			} else if (MouseY < 352) {
+			} else if (MouseY < VIEWPORT_HEIGHT) {
 				if (!gmenu_exception() && !TryIconCurs()) {
 					if (questlog && MouseX > 32 && MouseX < 288 && MouseY > 32 && MouseY < 308) {
 						QuestlogESC();
@@ -844,7 +844,7 @@ BOOL LeftMouseCmd(BOOL bShift)
 {
 	BOOL bNear;
 
-	/// ASSERT: assert(MouseY < 352);
+	/// ASSERT: assert(MouseY < VIEWPORT_HEIGHT);
 
 	if (leveltype == DTYPE_TOWN) {
 		if (pcursitem != -1 && pcurs == CURSOR_HAND)
@@ -972,7 +972,7 @@ void RightMouseDown()
 		} else if (!stextflag) {
 			if (spselflag) {
 				SetSpell();
-			} else if (MouseY >= 352
+			} else if (MouseY >= VIEWPORT_HEIGHT
 			    || (!sbookflag || MouseX <= 320)
 			        && !TryIconCurs()
 			        && (pcursinvitem == -1 || !UseInvItem(myplr, pcursinvitem))) {
@@ -1210,10 +1210,10 @@ void PressKey(int vkey)
 	} else if(vkey == VK_TAB) {
 		DoAutoMap();
 	} else if(vkey == VK_SPACE) {
-		if(!chrflag && invflag && MouseX < 480 && MouseY < 352) {
+		if(!chrflag && invflag && MouseX < 480 && MouseY < VIEWPORT_HEIGHT) {
 			SetCursorPos(MouseX + 160, MouseY);
 		}
-		if(!invflag && chrflag && MouseX > 160 && MouseY < 352) {
+		if(!invflag && chrflag && MouseX > 160 && MouseY < VIEWPORT_HEIGHT) {
 			SetCursorPos(MouseX - 160, MouseY);
 		}
 		helpflag = 0;
@@ -1294,11 +1294,11 @@ void PressChar(int vkey)
 			sbookflag = 0;
 			invflag = invflag == 0;
 			if(!invflag || chrflag) {
-				if(MouseX < 480 && MouseY < 352) {
+				if(MouseX < 480 && MouseY < VIEWPORT_HEIGHT) {
 					SetCursorPos(MouseX + 160, MouseY);
 				}
 			} else {
-				if(MouseX > 160 && MouseY < 352) {
+				if(MouseX > 160 && MouseY < VIEWPORT_HEIGHT) {
 					SetCursorPos(MouseX - 160, MouseY);
 				}
 			}
@@ -1310,11 +1310,11 @@ void PressChar(int vkey)
 			questlog = FALSE;
 			chrflag = chrflag == 0;
 			if(!chrflag || invflag) {
-				if(MouseX > 160 && MouseY < 352) {
+				if(MouseX > 160 && MouseY < VIEWPORT_HEIGHT) {
 					SetCursorPos(MouseX - 160, MouseY);
 				}
 			} else {
-				if(MouseX < 480 && MouseY < 352) {
+				if(MouseX < 480 && MouseY < VIEWPORT_HEIGHT) {
 					SetCursorPos(MouseX + 160, MouseY);
 				}
 			}
diff --git a/Source/engine.cpp b/Source/engine.cpp
index 065c9ea4b..850b2207e 100644
--- a/Source/engine.cpp
+++ b/Source/engine.cpp
@@ -2123,10 +2123,10 @@ void DrawLine(int x0, int y0, int x1, int y1, BYTE col)
 	if (x1 < 0 + 64 || x1 >= 640 + 64) {
 		gbNotInView = TRUE;
 	}
-	if (y0 < 0 + 160 || y0 >= 352 + 160) {
+	if (y0 < 0 + 160 || y0 >= VIEWPORT_HEIGHT + 160) {
 		gbNotInView = TRUE;
 	}
-	if (y1 < 0 + 160 || y1 >= 352 + 160) {
+	if (y1 < 0 + 160 || y1 >= VIEWPORT_HEIGHT + 160) {
 		gbNotInView = TRUE;
 	}
 
diff --git a/Source/gendung.cpp b/Source/gendung.cpp
index 6675303ae..23cf8dbdd 100644
--- a/Source/gendung.cpp
+++ b/Source/gendung.cpp
@@ -539,7 +539,7 @@ void SetDungeonMicros()
 
 	if (zoomflag) {
 		scr_pix_width = 640;
-		scr_pix_height = 352;
+		scr_pix_height = VIEWPORT_HEIGHT;
 		dword_5C2FF8 = 10;
 		dword_5C2FFC = 11;
 	} else {
diff --git a/Source/gmenu.cpp b/Source/gmenu.cpp
index d97ad5e9a..07155430c 100644
--- a/Source/gmenu.cpp
+++ b/Source/gmenu.cpp
@@ -359,7 +359,7 @@ BOOL gmenu_left_mouse(BOOL isDown)
 		if (!sgpCurrentMenu) {
 			return FALSE;
 		}
-		if (MouseY >= 352) {
+		if (MouseY >= VIEWPORT_HEIGHT) {
 			return FALSE;
 		}
 		if (MouseY - 117 >= 0) {
diff --git a/Source/inv.cpp b/Source/inv.cpp
index 563fd17b6..e61950485 100644
--- a/Source/inv.cpp
+++ b/Source/inv.cpp
@@ -1363,7 +1363,7 @@ void CheckInvItem()
 void CheckInvScrn()
 {
 	if (MouseX > 190 && MouseX < 437
-	    && MouseY > 352 && MouseY < 385) {
+	    && MouseY > VIEWPORT_HEIGHT && MouseY < 385) {
 		CheckInvItem();
 	}
 }
diff --git a/Source/player.cpp b/Source/player.cpp
index 7abab017c..87710ebdf 100644
--- a/Source/player.cpp
+++ b/Source/player.cpp
@@ -3618,7 +3618,7 @@ void CheckPlrSpell()
 	}
 
 	if (pcurs != CURSOR_HAND
-	    || MouseY >= 352
+	    || MouseY >= VIEWPORT_HEIGHT
 	    || (chrflag && MouseX < 320 || invflag && MouseX > 320)
 	        && rspell != SPL_HEAL
 	        && rspell != SPL_IDENTIFY
diff --git a/Source/scrollrt.cpp b/Source/scrollrt.cpp
index 80d886657..83d4be3e6 100644
--- a/Source/scrollrt.cpp
+++ b/Source/scrollrt.cpp
@@ -432,7 +432,7 @@ void DrawGame(int x, int y)
 	int i, sx, sy, chunks, blocks;
 
 	scr_pix_width = 640;
-	scr_pix_height = 352;
+	scr_pix_height = VIEWPORT_HEIGHT;
 	dword_5C2FF8 = 10;
 	dword_5C2FFC = 11;
 
@@ -505,7 +505,7 @@ void DrawGame(int x, int y)
 		sy += 16;
 	}
 	/// ASSERT: assert(gpBuffer);
-	gpBufEnd = &gpBuffer[PitchTbl[352 + SCREEN_Y]];
+	gpBufEnd = &gpBuffer[PitchTbl[VIEWPORT_HEIGHT + SCREEN_Y]];
 	for (i = 0; i < blocks; i++) {
 		scrollrt_draw_lower(x, y, sx, sy, chunks, 0);
 		y++;
diff --git a/Source/town.cpp b/Source/town.cpp
index 3e46d0a61..81d0e7e1f 100644
--- a/Source/town.cpp
+++ b/Source/town.cpp
@@ -931,7 +931,7 @@ void T_DrawGame(int x, int y)
 	int i, sx, sy, chunks, blocks;
 
 	scr_pix_width = 640;
-	scr_pix_height = 352;
+	scr_pix_height = VIEWPORT_HEIGHT;
 	dword_5C2FF8 = 10;
 	dword_5C2FFC = 11;
 
@@ -1280,7 +1280,7 @@ void SetTownMicros()
 
 	if (zoomflag) {
 		scr_pix_width = 640;
-		scr_pix_height = 352;
+		scr_pix_height = VIEWPORT_HEIGHT;
 		dword_5C2FF8 = 10;
 		dword_5C2FFC = 11;
 	} else {
diff --git a/Source/trigs.cpp b/Source/trigs.cpp
index c8dcd14c3..458b93c9b 100644
--- a/Source/trigs.cpp
+++ b/Source/trigs.cpp
@@ -654,7 +654,7 @@ void CheckTrigForce()
 {
 	trigflag = FALSE;
 
-	if(MouseY > 352 - 1) {
+	if(MouseY > VIEWPORT_HEIGHT - 1) {
 		return;
 	}
 
diff --git a/defs.h b/defs.h
index a8c1fe1e8..986323e36 100644
--- a/defs.h
+++ b/defs.h
@@ -108,6 +108,8 @@
 #define BUFFER_HEIGHT	(BORDER_TOP + SCREEN_HEIGHT + BORDER_BOTTOM)
 #define TILE_SIZE		32
 
+#define VIEWPORT_HEIGHT	352
+
 #define SCREENXY(x, y)	((x) + SCREEN_X + ((y) + SCREEN_Y) * BUFFER_WIDTH)
 
 #define MemFreeDbg(p)	\