--- src/hp48.h.orig	Thu Oct  6 19:54:57 2011
+++ src/hp48.h	Thu Oct  6 19:55:20 2011
@@ -227,7 +227,7 @@ typedef struct saturn_t {
 
   word_8	unknown2;
 
-  char		timer1;		/* may NOT be unsigned !!! */
+  signed char	timer1;		/* may NOT be unsigned !!! */
   word_32	timer2;
 
   long		t1_instr;