diff --git a/source/build/include/pragmas.h b/source/build/include/pragmas.h
index 527cb03eb..922917289 100644
--- a/source/build/include/pragmas.h
+++ b/source/build/include/pragmas.h
@@ -189,6 +189,9 @@ void qinterpolatedown16short(intptr_t bufptr, int32_t num, int32_t val, int32_t
 #ifndef pragmas_have_clearbuf
 void clearbuf(void *d, int32_t c, int32_t a);
 #endif
+#ifndef pragmas_have_copybuf
+void copybuf(const void *s, void *d, int32_t c);
+#endif
 #ifndef pragmas_have_swaps
 void swapbuf4(void *a, void *b, int32_t c);
 #endif
@@ -196,6 +199,9 @@ void swapbuf4(void *a, void *b, int32_t c);
 #ifndef pragmas_have_clearbufbyte
 void clearbufbyte(void *D, int32_t c, int32_t a);
 #endif
+#ifndef pragmas_have_copybufbyte
+void copybufbyte(const void *S, void *D, int32_t c);
+#endif
 #ifndef pragmas_have_copybufreverse
 void copybufreverse(const void *S, void *D, int32_t c);
 #endif
diff --git a/source/build/src/engine.cpp b/source/build/src/engine.cpp
index 81cdea343..bce1a3be7 100644
--- a/source/build/src/engine.cpp
+++ b/source/build/src/engine.cpp
@@ -4478,7 +4478,7 @@ static void classicDrawBunches(int32_t bunch)
                         smostwall[smostwallcnt] = z;
                         smostwalltype[smostwallcnt] = 1;   //1 for umost
                         smostwallcnt++;
-                        memcpy(&umost[x1],&smost[smostcnt],i*sizeof(smost[0]));
+                        copybufbyte(&umost[x1],&smost[smostcnt],i*sizeof(smost[0]));
                         smostcnt += i;
                     }
                 }
@@ -4564,7 +4564,7 @@ static void classicDrawBunches(int32_t bunch)
                         smostwall[smostwallcnt] = z;
                         smostwalltype[smostwallcnt] = 2;   //2 for dmost
                         smostwallcnt++;
-                        memcpy(&dmost[x1],&smost[smostcnt],i*sizeof(smost[0]));
+                        copybufbyte(&dmost[x1],&smost[smostcnt],i*sizeof(smost[0]));
                         smostcnt += i;
                     }
                 }
@@ -5033,6 +5033,16 @@ static void classicDrawVoxel(int32_t dasprx, int32_t daspry, int32_t dasprz, int
         }
     }
 
+#if 0
+    for (x=0; x<xdimen; x++)
+    {
+        if (daumost[x]>=0 && daumost[x]<ydimen)
+            *(char *)(frameplace + x + bytesperline*daumost[x]) = editorcolors[13];
+        if (dadmost[x]>=0 && dadmost[x]<ydimen)
+            *(char *)(frameplace + x + bytesperline*dadmost[x]) = editorcolors[14];
+    }
+#endif
+
     videoEndDrawing();   //}}}
 }
 
@@ -11638,8 +11648,8 @@ void renderSetTarget(int16_t tilenume, int32_t xsiz, int32_t ysiz)
     rendmode = REND_CLASSIC;
 #endif
 
-    memcpy(&startumost[windowxy1.x],&bakumost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(bakumost[0]));
-    memcpy(&startdmost[windowxy1.x],&bakdmost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(bakdmost[0]));
+    copybufbyte(&startumost[windowxy1.x],&bakumost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(bakumost[0]));
+    copybufbyte(&startdmost[windowxy1.x],&bakdmost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(bakdmost[0]));
     setviewcnt++;
 
     offscreenrendering = 1;
@@ -11673,8 +11683,8 @@ void renderRestoreTarget(void)
     ydim = bakysiz[setviewcnt];
     videoSetViewableArea(bakwindowxy1[setviewcnt].x,bakwindowxy1[setviewcnt].y,
             bakwindowxy2[setviewcnt].x,bakwindowxy2[setviewcnt].y);
-    memcpy(&bakumost[windowxy1.x],&startumost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(startumost[0]));
-    memcpy(&bakdmost[windowxy1.x],&startdmost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(startdmost[0]));
+    copybufbyte(&bakumost[windowxy1.x],&startumost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(startumost[0]));
+    copybufbyte(&bakdmost[windowxy1.x],&startdmost[windowxy1.x],(windowxy2.x-windowxy1.x+1)*sizeof(startdmost[0]));
     frameplace = bakframeplace[setviewcnt];
 
     calc_ylookup((setviewcnt == 0) ? bytesperline : bakxsiz[setviewcnt],
diff --git a/source/build/src/pragmas.cpp b/source/build/src/pragmas.cpp
index 1d81f48e6..219849540 100644
--- a/source/build/src/pragmas.cpp
+++ b/source/build/src/pragmas.cpp
@@ -71,6 +71,17 @@ void clearbuf(void *d, int32_t c, int32_t a)
 }
 #endif
 
+#ifndef pragmas_have_copybuf
+void copybuf(const void *s, void *d, int32_t c)
+{
+    auto p = (const int32_t *) s;
+    auto q = (int32_t *) d;
+
+    while (c--)
+        *q++ = *p++;
+}
+#endif
+
 #ifndef pragmas_have_swaps
 void swapbuf4(void *a, void *b, int32_t c)
 {
@@ -102,6 +113,16 @@ void clearbufbyte(void *D, int32_t c, int32_t a)
 }
 #endif
 
+#ifndef pragmas_have_copybufbyte
+void copybufbyte(const void *s, void *d, int32_t c)
+{
+    auto src = (const char *)s;
+    auto dst = (char *)d;
+
+    while (c--)
+        *dst++ = *src++;
+}
+#endif
 
 
 // copybufreverse() is a special case: use the assembly version for GCC on x86
diff --git a/source/rr/src/net.cpp b/source/rr/src/net.cpp
index 9d5838e43..f46f7cd9a 100644
--- a/source/rr/src/net.cpp
+++ b/source/rr/src/net.cpp
@@ -1802,7 +1802,7 @@ void Net_GetInput(void)
     
     if (g_player[myconnectindex].movefifoend&(g_movesPerPacket-1))
     {
-        memcpy(&inputfifo[(g_player[myconnectindex].movefifoend-1)&(MOVEFIFOSIZ-1)][myconnectindex],
+        copybufbyte(&inputfifo[(g_player[myconnectindex].movefifoend-1)&(MOVEFIFOSIZ-1)][myconnectindex],
                     &inputfifo[g_player[myconnectindex].movefifoend&(MOVEFIFOSIZ-1)][myconnectindex],sizeof(input_t));
         g_player[myconnectindex].movefifoend++;
         return;
@@ -2180,7 +2180,7 @@ void Net_ParsePacket(uint8_t *packbuf, int packbufleng)
                 continue;
             }
 
-            memcpy(&osyn[i],&nsyn[i],sizeof(input_t));
+            copybufbyte(&osyn[i],&nsyn[i],sizeof(input_t));
             if (l&1)   nsyn[i].fvel = packbuf[j]+((short)packbuf[j+1]<<8), j += 2;
             if (l&2)   nsyn[i].svel = packbuf[j]+((short)packbuf[j+1]<<8), j += 2;
             if (l&4)
@@ -2219,7 +2219,7 @@ void Net_ParsePacket(uint8_t *packbuf, int packbufleng)
         if (i != myconnectindex)
             for (j=g_movesPerPacket-1;j>=1;j--)
             {
-                memcpy(&nsyn[i],&inputfifo[g_player[i].movefifoend&(MOVEFIFOSIZ-1)][i],sizeof(input_t));
+                copybufbyte(&nsyn[i],&inputfifo[g_player[i].movefifoend&(MOVEFIFOSIZ-1)][i],sizeof(input_t));
                 g_player[i].movefifoend++;
             }
 
@@ -2233,7 +2233,7 @@ void Net_ParsePacket(uint8_t *packbuf, int packbufleng)
         osyn = (input_t *)&inputfifo[(g_player[other].movefifoend-1)&(MOVEFIFOSIZ-1)][0];
         nsyn = (input_t *)&inputfifo[(g_player[other].movefifoend)&(MOVEFIFOSIZ-1)][0];
 
-        memcpy(&osyn[other],&nsyn[other],sizeof(input_t));
+        copybufbyte(&osyn[other],&nsyn[other],sizeof(input_t));
         if (k&1)   nsyn[other].fvel = packbuf[j]+((short)packbuf[j+1]<<8), j += 2;
         if (k&2)   nsyn[other].svel = packbuf[j]+((short)packbuf[j+1]<<8), j += 2;
         if (k&4)
@@ -2272,7 +2272,7 @@ void Net_ParsePacket(uint8_t *packbuf, int packbufleng)
 
         for (i=g_movesPerPacket-1;i>=1;i--)
         {
-            memcpy(&nsyn[other],&inputfifo[g_player[other].movefifoend&(MOVEFIFOSIZ-1)][other],sizeof(input_t));
+            copybufbyte(&nsyn[other],&inputfifo[g_player[other].movefifoend&(MOVEFIFOSIZ-1)][other],sizeof(input_t));
             g_player[other].movefifoend++;
         }
 
@@ -2296,7 +2296,7 @@ void Net_ParsePacket(uint8_t *packbuf, int packbufleng)
         osyn = (input_t *)&inputfifo[(g_player[other].movefifoend-1)&(MOVEFIFOSIZ-1)][0];
         nsyn = (input_t *)&inputfifo[(g_player[other].movefifoend)&(MOVEFIFOSIZ-1)][0];
 
-        memcpy(&osyn[other],&nsyn[other],sizeof(input_t));
+        copybufbyte(&osyn[other],&nsyn[other],sizeof(input_t));
         k = packbuf[j] + (int)(packbuf[j+1]<<8);
         j += 2;
 
@@ -2332,7 +2332,7 @@ void Net_ParsePacket(uint8_t *packbuf, int packbufleng)
 
         for (i=g_movesPerPacket-1;i>=1;i--)
         {
-            memcpy(&nsyn[other],&inputfifo[g_player[other].movefifoend&(MOVEFIFOSIZ-1)][other],sizeof(input_t));
+            copybufbyte(&nsyn[other],&inputfifo[g_player[other].movefifoend&(MOVEFIFOSIZ-1)][other],sizeof(input_t));
             g_player[other].movefifoend++;
         }
 
diff --git a/source/sw/src/sector.cpp b/source/sw/src/sector.cpp
index e62347ed8..d393242e2 100644
--- a/source/sw/src/sector.cpp
+++ b/source/sw/src/sector.cpp
@@ -3178,7 +3178,7 @@ void movelava(char *dapic)
     offs2 = (LAVASIZ + 2) + 1 + ((intptr_t) lavabakpic);
     for (x = 0; x < LAVASIZ; x++)
     {
-        memcpy(offs, offs2, LAVASIZ);
+        copybuf(offs, offs2, LAVASIZ >> 2);
         offs += LAVASIZ;
         offs2 += LAVASIZ + 2;
     }