--- VAX/vax_sysdev.c.orig	Sun Apr 29 19:02:06 2012
+++ VAX/vax_sysdev.c	Wed Jun 13 06:36:24 2012
@@ -54,6 +54,10 @@
 
 #include "vax_defs.h"
 
+#ifndef PATH_KA655X_BIN
+#define PATH_KA655X_BIN "ka655x.bin"
+#endif
+
 #define UNIT_V_NODELAY  (UNIT_V_UF + 0)                 /* ROM access equal to RAM access */
 #define UNIT_NODELAY    (1u << UNIT_V_NODELAY)
 
@@ -1552,10 +1556,10 @@ conpsl = PSL_IS | PSL_IPL1F | CON_PWRUP;
 if (rom == NULL)
     return SCPE_IERR;
 if (*rom == 0) {                                        /* no boot? */
-    printf ("Loading boot code from ka655x.bin\n");
+    printf ("Loading boot code from %s\n", PATH_KA655X_BIN);
     if (sim_log)
-        fprintf (sim_log, "Loading boot code from ka655x.bin\n");
-    r = load_cmd (0, "-R ka655x.bin");
+        fprintf (sim_log, "Loading boot code from %s\n", PATH_KA655X_BIN);
+    r = load_cmd (0, "-R " PATH_KA655X_BIN);
     if (r != SCPE_OK)
         return r;
     }