diff -urk.orig procps-3.2.5.orig/top.c procps-3.2.5/top.c
--- procps-3.2.5.orig/top.c	2005-08-24 22:12:01 +0000
+++ procps-3.2.5/top.c	2005-08-24 22:16:30 +0000
@@ -2430,19 +2430,24 @@
 {
    // standardized 'secure mode' errors
    static const char err_secure[] = "\aUnavailable in secure mode";
+   static const char err_num_cpus[] = "\aSorry, terminal is not big enough";
 #ifdef WARN_NOT_SMP
    // standardized 'smp' errors
-   static const char err_smp[] = "\aSorry, only 1 cpu detected";
+   static const char err_smp[] = "\aSorry, only one cpu detected";
 #endif
 
    switch (c) {
       case '1':
+	 if ((Screen_rows < (Cpu_tot+4)) && (Cpu_tot > 1))
+		show_msg(err_num_cpus);
+	 else {
 #ifdef WARN_NOT_SMP
          if (Cpu_tot > 1) TOGw(Curwin, View_CPUSUM);
          else show_msg(err_smp);
 #else
          TOGw(Curwin, View_CPUSUM);
 #endif
+	 }
          break;
 
       case 'a':
diff -urk.orig procps-3.2.5.orig/top.h procps-3.2.5/top.h
--- procps-3.2.5.orig/top.h	2005-08-24 22:12:01 +0000
+++ procps-3.2.5/top.h	2005-08-24 22:16:30 +0000
@@ -27,7 +27,7 @@
 //#define CASEUP_SCALE    // show scaled time/num suffix upper case
 //#define CASEUP_SUMMK    // show memory summary kilobytes with 'K'
 //#define SORT_SUPRESS    // *attempt* to reduce qsort overhead
-//#define WARN_NOT_SMP    // restrict '1' & 'I' commands to true smp
+#define WARN_NOT_SMP    // restrict '1' & 'I' commands to true smp
 
 // Development/Debugging defines -----------------------------------
 //#define ATEOJ_REPORT    // report a bunch of stuff, at end-of-job