diff --git a/mac-cpp-source/VNCConfig.h b/mac-cpp-source/VNCConfig.h
index 5326e49..33eafd2 100644
--- a/mac-cpp-source/VNCConfig.h
+++ b/mac-cpp-source/VNCConfig.h
@@ -40,7 +40,9 @@
 
 //#define VNC_FB_RES_512_342
 //#define VNC_FB_RES_512_384
+//#define VNC_FB_RES_608_431
 //#define VNC_FB_RES_640_480
+//#define VNC_FB_RES_720_364
 //#define VNC_FB_RES_1024_768
 
 /**
diff --git a/mac-cpp-source/VNCScreenHash.cpp b/mac-cpp-source/VNCScreenHash.cpp
index fcd27c5..ff0e230 100644
--- a/mac-cpp-source/VNCScreenHash.cpp
+++ b/mac-cpp-source/VNCScreenHash.cpp
@@ -26,8 +26,13 @@
     int ShowStatus(const char* format, ...);
 #endif
 
-#define COL_HASH_SIZE       (VNC_BYTES_PER_LINE/sizeof(long))
-#define ROW_HASH_SIZE       (VNC_FB_HEIGHT)
+#ifdef VNC_BYTES_PER_LINE
+    #define COL_HASH_SIZE ((VNC_BYTES_PER_LINE + sizeof(unsigned long) - 1)/sizeof(unsigned long))
+    #define ROW_HASH_SIZE (VNC_FB_HEIGHT)
+#else
+    #define COL_HASH_SIZE ((fbStride + sizeof(unsigned long) - 1)/sizeof(unsigned long))
+    #define ROW_HASH_SIZE fbHeight;
+#endif
 
 //#define TEST_HASH
 //#define HASH_COLUMNS_FIRST
@@ -63,14 +68,8 @@ static MonoHashData *data = NULL;
 void unionRect(const VNCRect *a,VNCRect *b);
 
 OSErr VNCScreenHash::setup() {
-    #ifdef VNC_BYTES_PER_LINE
-        const size_t colHashSize = VNC_BYTES_PER_LINE/sizeof(unsigned long);
-        const size_t rowHashSize = VNC_FB_HEIGHT;
-    #else
-        const size_t colHashSize = fbStride/sizeof(unsigned long);
-        const size_t rowHashSize = fbHeight;
-    #endif
-
+    const size_t colHashSize = COL_HASH_SIZE;
+    const size_t rowHashSize = ROW_HASH_SIZE;
     const size_t dataSize = sizeof(MonoHashData) + (colHashSize + rowHashSize) * 2 * sizeof(unsigned long);
     data = (MonoHashData*) NewPtr(dataSize);
     if (MemError() != noErr)
@@ -288,22 +287,13 @@ void VNCScreenHash::beginCompute() {
             memset(data->rowHashNext, 0, fbHeight * sizeof(unsigned long));
         #endif
     #else
-        #ifdef VNC_BYTES_PER_LINE
-            memset(data->colHashNext, 0, VNC_BYTES_PER_LINE);
-        #else
-            memset(data->colHashNext, 0, fbStride);
-        #endif
+        memset(data->colHashNext, 0, COL_HASH_SIZE * sizeof(unsigned long));
     #endif
 }
 
 void VNCScreenHash::computeDirty(int &x, int &y, int &w, int &h) {
-    #ifdef VNC_BYTES_PER_LINE
-        const unsigned int colHashSize = VNC_BYTES_PER_LINE/sizeof(unsigned long);
-        const unsigned int rowHashSize = VNC_FB_HEIGHT;
-    #else
-        const unsigned int colHashSize = fbStride/sizeof(unsigned long);
-        const unsigned int rowHashSize = fbHeight;
-    #endif
+    const size_t colHashSize = COL_HASH_SIZE;
+    const size_t rowHashSize = ROW_HASH_SIZE;
     #ifdef VNC_FB_BITS_PER_PIX
         const unsigned char pixPerByte = 8 / VNC_FB_BITS_PER_PIX;
     #else
@@ -477,7 +467,7 @@ asm void VNCScreenHash::computeHashesFast(unsigned int rows) {
         #endif
 
         bra transferChunk
-    transferLoop:
+    chunkLoop:
         // Transfer 16 bytes at a time using four registers
         movem.l (a0)+,d1-d4        // Load 128 pixels
         adda.l  d1,a3              // Add to line sum
@@ -490,7 +480,28 @@ asm void VNCScreenHash::computeHashesFast(unsigned int rows) {
         add.l   d4,(a1)+
 
     transferChunk:
-        dbra d5, transferLoop
+        dbra d5, chunkLoop
+
+        // Transfer remaining bytes that are not divisible by 16 bytes
+        // in chunks of two bytes instead.
+
+        #ifndef VNC_BYTES_PER_LINE
+            move.w fbStride,d5
+            and.w #15,d5
+            asr.w #1,d5
+        #else
+            move.w #(VNC_BYTES_PER_LINE & 15) / 2, d5
+        #endif
+
+        bra transferWords
+    wordLoop:
+        // Transfer two bytes at a time using one register
+        move.w (a0)+,d1            // Load 16 pixels
+        adda.w  d1,a3              // Add to line sum
+        add.w   d1,(a1)+           // Add to values to column hashes
+
+    transferWords:
+        dbra d5, wordLoop
     #endif
 
     move.l a3,(a2)+            // Write the line sum
diff --git a/mac-cpp-source/VNCServer.h b/mac-cpp-source/VNCServer.h
index 33f655f..b428a0d 100644
--- a/mac-cpp-source/VNCServer.h
+++ b/mac-cpp-source/VNCServer.h
@@ -41,6 +41,16 @@ Boolean vncServerStopped();
   #define VNC_FB_WIDTH        640
   #define VNC_FB_HEIGHT       480
 
+#elif defined(VNC_FB_RES_608_431)
+  // Apple Lisa w/ Screen Kit
+  #define VNC_FB_WIDTH        608
+  #define VNC_FB_HEIGHT       431
+
+#elif defined(VNC_FB_RES_720_364)
+  // Apple Lisa
+  #define VNC_FB_WIDTH        720
+  #define VNC_FB_HEIGHT       364
+
 #elif defined(VNC_FB_RES_1024_768)
   #define VNC_FB_WIDTH        1024
   #define VNC_FB_HEIGHT       768