diff --git a/README b/README
index 49f9f6f..27e31c9 100644
--- a/README
+++ b/README
@@ -70,8 +70,10 @@ the SDL-based version of Executor on Mac OS X Intel, you can try:
   ../../util/configure.sh  '--target=i486-macosx' '--host=i486-macosx' '--front-end=sdl' '--cflags=-fno-strict-aliasing -I/usr/X11R6/include -O0 -finline-functions -g -Wall' '--root=../..' '--target-file-format=glibc' '--sound=sdl' '--syn68k-target=i486-macosx-glibc'
   make
 
-If you have SDL installed and would like to build (but not run) the
-SDL-based version of Executor on Mac OS X PPC, you can try:
+If you have SDL installed and would like to play with the SDL-based
+version of Executor on Mac OS X PPC, you can try the following.  Be aware that
+the Mac OS X PPC port is the most recent port and is likely to have problems
+above and beyond those of the other ports.
 
   mkdir -p build/debug-macosx-sdl
   cd build/debug-macosx-sdl
diff --git a/TODO b/TODO
index a55f2bf..98c6e83 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,11 @@
-        link with a debugging version of Syn68k and figure out where
-        the Mac OS X PPC port is dieing
+        Look into Mac OS X PPC glitches
+
+                cards don't work right in Eric's Ultimate Solitaire demo
+
+        Yank all the misleading RCS strings
+
+        Update the copyright notices to make it that the code is under
+        an MIT-style license
 
 	package up the System Folder and whatnot so that people w/o the
 	old executor-aux can run Executor
diff --git a/src/emutrap.c b/src/emutrap.c
index 75528b6..ef08949 100644
--- a/src/emutrap.c
+++ b/src/emutrap.c
@@ -22,6 +22,29 @@ char ROMlib_rcsid_emutrap[] =
  *	 to heck with them.
  */
 
+/*
+ * The first time this code was running on a PowerPC was on an old
+ * version of Yellow Dog Linux.  The calling conventions were
+ * different than what we get when compiling on Mac OS X.  As such,
+ * there are some places where we check for the preprocessing macro
+ * "powerpc" and are really concerned with the old calling convention.
+ * There are othe times when we check for either powerpc or __ppc__ in
+ * which case the calling convention shouldn't matter.
+ *
+ * TODO: switch to a modern version of the GNU build system and use it
+ *       to determine calling convention issues.
+ *
+ * The Yellow Dog version was actually able to run a few PPC binaries,
+ * including (IIRC) the demo versions of a couple of Adobe products
+ * (Photoshop and Illustrator?).  However, none of the code fragment
+ * manager or mixed-mode code has been tested in years and never under
+ * Mac OS X.  In the incredibly unlikely circumstance that someone
+ * wants to play with that code and has questions, I'll be happy to
+ * answer them to the best of my ability, but it was a long time ago
+ * and was short-lived, so my memory is a bit weak.
+ *
+ */
+
 #define SYN68K_TO_US_CHECK0_CHECKNEG1(addr)			\
 ({								\
   typeof(addr) __t;						\
@@ -42,7 +65,7 @@ PUBLIC syn68k_addr_t PascalToCCall(syn68k_addr_t ignoreme, ptocblock_t *infop)
 {
     unsigned short pth, ptv;
     LONGINT args[11], retval;
-#if defined (powerpc) || defined (__ppc__)
+#if defined (powerpc)
     Point points[11];
     int point_count = 0;
 #endif
@@ -94,7 +117,7 @@ PUBLIC syn68k_addr_t PascalToCCall(syn68k_addr_t ignoreme, ptocblock_t *infop)
 	    ptv = POPSW();
 	    pth = POPSW();
 #if !defined(LITTLEENDIAN)
-#if !defined (powerpc) && !defined (__ppc__)
+#if !defined (powerpc)
 	    args[count++] = (ptv << 16) | pth;
 #else
 	    points[point_count].h = pth;
@@ -221,7 +244,7 @@ CToPascalCall_m68k(void *wheretogo, unsigned long long magic, va_list ap)
 	case 3:
 	    ul = va_arg(ap, ULONGINT);
 #if !defined(LITTLEENDIAN)
-#if !defined (powerpc) && !defined (__ppc__)
+#if !defined (powerpc)
 	    PUSHUW(ul);
 	    PUSHUW(ul >> 16);
 #else
@@ -344,7 +367,7 @@ CToRoutineDescriptorCall (const RoutineDescriptor *p, unsigned long long magic,
 	case 3: /* point */
 	  {
 	    arg = (uint32) va_arg (ap, unsigned long);
-#if defined (powerpc) || defined (__ppc__)
+#if defined (powerpc)
 	    arg = *(uint32 *)arg;
 #endif
 	    arg = (CW ((uint16) arg) | 
diff --git a/src/include/rsys/byteswap.h b/src/include/rsys/byteswap.h
index 1a1b0d3..3fde584 100644
--- a/src/include/rsys/byteswap.h
+++ b/src/include/rsys/byteswap.h
@@ -15,8 +15,17 @@
 #define CLV(rhs)	(rhs)
 #define Cx(rhs)		(rhs)
 
-#define MR(rhs)		(rhs) /* Mac to ROMlib */
-#define RM(rhs)		(rhs) /* ROMlib to Mac */
+#if 0
+ * Do not use these blindly on big-endian machines.  There's no longer a
+ * guarantee that we can get low-memory on all big-endian machines.  It doesn't
+ * work, for example, on Mac OS X PPC.
+ *
+ * #define MR(rhs)		(rhs) /* Mac to ROMlib */
+ * #define RM(rhs)		(rhs) /* ROMlib to Mac */
+#endif
+
+#define MR(n)  ((typeof (n))({ typeof (n) _t = n; _t ? ((((unsigned long) (_t))) + ROMlib_offset) : 0;}))
+#define RM(n)  ((typeof (n))({ typeof (n) _t = n; _t ? ((((unsigned long) (_t)- ROMlib_offset)) ) : 0;}))
 
 #define CLC_NULL NULL