--- a/os9/makerom.c	Wed Jul 04 21:30:24 2018 +0900
+++ b/os9/makerom.c	Thu Jul 05 00:02:54 2018 +0900
@@ -7,8 +7,9 @@
 #include <strings.h>
 #include <sys/stat.h>
 
-#define IOBASE 0xe000
-#define IOSIZE 0x100
+int IOBASE = 0xe000;
+int IOSIZE = 0x100;
+char * outfile ;
 
 typedef struct os9module {
    int size;
@@ -85,7 +86,19 @@
  root.mod = 0;
  m = &root;
 
- for(int i = 2 ; i<ac ; i++ ) {
+ for(int i = 1 ; i<ac ; i++ ) {
+    if (*av[i]=='-') {
+        if (av[i][1] =='i') {
+            IOBASE = strtol(av[i],(char**)0,0);
+            i += 1;
+        } else if (av[i][1] =='o') {
+            outfile = av[i+1];
+            i += 1;
+        } else {
+            return 1;
+        }
+        continue;
+    }
     struct os9module *cur;
     cur = readOS9module(av[i]);
     m->next = cur;
@@ -94,8 +107,9 @@
 
  FILE *romfile;
  unsigned pos;
+ if (outfile==0) return 1;
 
- romfile=fopen(av[1],"wb");
+ romfile=fopen(outfile,"wb");
  if(!romfile) {
   fprintf(stderr,"Cannot create file %s\n",av[1]);
   exit(1);
@@ -108,7 +122,8 @@
 
  pos = start;
  for(struct os9module *cur = root.next; cur ; cur = cur->next ) {
-    if ( cur->size && (cur->name[0]=='O' && cur->name[1]=='S' && cur->name[2]== -71)) {
+    // last module have to os9p1
+    if ( cur->next == 0 ) { //   cur->size && (cur->name[0]=='O' && cur->name[1]=='S' && cur->name[2]== -71)) {
        for(; pos < 0xf800 ; pos++) {   // os9p1 begins at 0xf800
           fputc(0xff,romfile);
        }