--- VAX/vax780_sbi.c.orig	Mon Mar 19 18:08:46 2012
+++ VAX/vax780_sbi.c	Wed Jun 13 06:39:29 2012
@@ -35,6 +35,10 @@
 
 #include "vax_defs.h"
 
+#ifndef PATH_VMB_EXE
+#define PATH_VMB_EXE   "vmb.exe"
+#endif
+
 /* 11/780 specific IPRs */
 
 /* Writeable control store */
@@ -686,10 +690,10 @@ t_stat cpu_boot (int32 unitno, DEVICE *dptr)
 {
 t_stat r;
 
-printf ("Loading boot code from vmb.exe\n");
+printf ("Loading boot code from %s\n", PATH_VMB_EXE);
 if (sim_log)
-    fprintf (sim_log, "Loading boot code from vmb.exe\n");
-r = load_cmd (0, "-O vmb.exe 200");
+    fprintf (sim_log, "Loading boot code from %s\n", PATH_VMB_EXE);
+r = load_cmd (0, "-O " PATH_VMB_EXE " 200");
 if (r != SCPE_OK)
     return r;
 SP = PC = 512;