diff -urN dev86-0.16.9-vanila/ld/globvar.h dev86-0.16.9/ld/globvar.h
--- dev86-0.16.9-vanila/ld/globvar.h	Fri Nov  1 02:20:12 2002
+++ dev86-0.16.9/ld/globvar.h	Fri Nov  1 02:23:53 2002
@@ -13,6 +13,7 @@
 /* K&R _explicitly_ says extern followed by public is OK */
 extern char hexdigit[];			/* constant */
 extern int  headerless;			/* Don't output header on exe */
+extern int  bigheader;
 extern int  cpm86;			/* Generate CP/M-86 CMD header */
 
 extern bin_off_t text_base_value;	/* Base address of text seg */
diff -urN dev86-0.16.9-vanila/ld/ld.c dev86-0.16.9/ld/ld.c
--- dev86-0.16.9-vanila/ld/ld.c	Fri Nov  1 02:20:11 2002
+++ dev86-0.16.9/ld/ld.c	Fri Nov  1 02:24:46 2002
@@ -19,6 +19,7 @@
 PUBLIC bin_off_t data_base_value = 0;	/* XXX */
 PUBLIC bin_off_t heap_top_value  = 0;	/* XXX */
 PUBLIC int headerless = 0;
+PUBLIC int bigheader = 0;
 PUBLIC int cpm86 = 0;
 PUBLIC char hexdigit[] = "0123456789abcdef";
 
@@ -176,6 +177,7 @@
 		   data_base_value = strtoul(arg+2, (char **)0, 16);
 		if (errno != 0)
 		    use_error("invalid data address");
+		bigheader = 1;
 		break;
 	    case 'H':		/* heap top address */
 		if (arg[2] == 0 && ++argn >= argc)
diff -urN dev86-0.16.9-vanila/ld/writex86.c dev86-0.16.9/ld/writex86.c
--- dev86-0.16.9-vanila/ld/writex86.c	Fri Nov  1 02:20:12 2002
+++ dev86-0.16.9/ld/writex86.c	Fri Nov  1 02:27:50 2002
@@ -18,7 +18,7 @@
 #define ELF_SYMS 0
 #endif
 
-#  define FILEHEADERLENGTH (headerless?0:(cpm86?CPM86_HEADERLEN:A_MINHDR))
+#  define FILEHEADERLENGTH (headerless?0:(bigheader?sizeof(struct exec):(cpm86?CPM86_HEADERLEN:A_MINHDR)))
 				/* part of header not counted in offsets */
 #define DPSEG 2
 
@@ -651,8 +651,10 @@
 
     offtocn((char *) &header.a_total, (bin_off_t) heap_top_value,
 	    sizeof header.a_total);
-    if( FILEHEADERLENGTH )
-       writeout((char *) &header, FILEHEADERLENGTH);
+    if(bigheader)
+	offtocn((char *) &header.a_dbase, data_base_value, sizeof header.a_dbase);
+    if( header.a_hdrlen )
+       writeout((char *) &header, header.a_hdrlen);
 }
 
 PRIVATE void writenulls(count)
diff -urN dev86-0.16.9-vanila/libc/bcc/heap.c dev86-0.16.9/libc/bcc/heap.c
--- dev86-0.16.9-vanila/libc/bcc/heap.c	Fri Nov  1 02:20:12 2002
+++ dev86-0.16.9/libc/bcc/heap.c	Fri Nov  1 02:34:02 2002
@@ -44,9 +44,6 @@
   js	go_down
   add	ax,[brk_addr]	! Goin up!
   jc	Enomem
-  sub	bx,#511		! Safety space 512 bytes
-  cmp	bx,ax		! Too close ?
-  jb	Enomem
 
 sbrk_ok:
 #if !defined(__MSDOS__) && !defined(__STANDALONE__)