Keyboard Clutter, Keystroke Counts & Calculator Menus

Supplementary Material to Accompany The HPCC Datafile V27N1 Article

Jake Schwartz 29 November 2007 Questions or Comments? email:jakes@pahhc.org

The complete keyboard metrics data for the Hewlett-Packard Classics Series calculators:

                                             
      HP 35 HP 45 HP 55 HP 65 HP 67 HP 70 HP 80  
     
    tot # keys   35 35 35 35 35 35 35  
     
    # generic shift keys (i.e. "f", "g")   0 1 2 3 3 0 1  
        (gold) f, g f, f-1, g f, g, h   (gold)  
    # marked generically-shifted fcns (f ASIN, etc.) 0 23 48 38 75 0 11  
            f¯¹        
    # unmarked generically-shifted fcns (f·¹ ASIN) 0 0 0 15 0 0 0  
     
    # functional shift keys (i.e. "DSP", "STO")   1 3 3 5 4 2 0  
      arc STO, RCL, FIX STO,RCL,FIX DSP, GTO, LBL, STO, RCL STO, RCL, DSP, GTO STO, DSP FIX, SCI  
    # unmarked shifted fcns (DSP n, etc.)   3 28 30 58 59 13 10  
     
    # 3-key shifted A     1 1 1 3      
        f SCI GTO nn DSP . SF, CF, F? 0-3      
    # fcns per 3-key shifted A     10 50 10 4      
         
    # 3-key sequences B     4 1 4 1      
        STO +-x÷ n f SCI  STO + - x ÷ GTO f a-e      
    # fcns per 3-key seq B     9 10 9 5      
         
    # 3-key sequences C     4 2   1      
        RCL +-x÷ n STO •, RCL •   f LBL 0-9 A-E, g LBLf a-e      
    # fcns per 3-key seq C     9 10   20      
                     
    # 3-key sequences D       4   4      
          STO +-x÷   STO + - x ÷ 0-9, (i)      
    # fcns per 3-key seq D       10   11      
                     
    # 3-key sequences E           1      
              f GSB 0-9,A-E,(i), g GSBf a-e      
    # fcns per 3-key seq E         0 21      
                                         
                     
    # primary keys   34 31 30 32 32 33 34   tot # keys - tot # shift keys  
     
    tot # primary fcns   34 31 29 27 27 33 34   # primary keys - # functional shift keys  
     
    tot # shift keys   1 4 5 8 7 2 1   # generic shift keys + # functional shift keys  
     
    tot # 2-key shifted fcns   3 51 78 111 134 13 21   # marked shifted fcns + # unmarked shifted fcns  
     
    tot # 3-key sequences   0 82 120 46 102 0 0   (# 3-key sequences A * # fcns per 3-key seq A) + (# 3-key sequences B * # fcns per 3-key seq B)+…+( E)
     
    tot # functions   37 164 227 184 263 46 55   # primary keys + tot # 2-key shifted functions + tot # 3-key sequences  
     
    Keyboard Clutter (# fcns per key)   1.000 1.657 2.343 2.000 3.257 1.000 1.286   tot # fcns on keyboard / tot # keys  
     
    Keystroke Count   40 379 545 387 601 59 76   # primary keys + (2 * tot # shifted functions) + (3 * tot # 3-key sequences)  
     
    Keystroke count per function   1.081 2.311 2.401 2.103 2.285 1.283 1.382   Keystroke count / total # functions  
       

HP35

HP 45

HP 55

HP 65

HP 67

HP 70

HP 80

                        
     
      Ref: 65 Notes V2N1P11 Ref: 65 Notes V4N1P8  

Detailed Individual Classic-Series Calculator Metrics Charts:

HP35A HP45A HP55A HP65A HP67A
HP70A HP80A      

 

        Woodstock Series Key Functions and Metrics        
                       
  HP 21   HP 22   HP 25   HP 27   HP 29C    
                       
tot # keys   30   30   30   30   30    
                       
# generic shift keys (i.e. "f", "g")   1   1   2   2   2    
  (blue)   (gold)   f, g   f, g   f, g    
# marked shifted fcns (f ASIN, etc.)   16   18   44   45   48    
      gold 0-9                
# unmarked shifted fcns (f·¹ ASIN)   0   10                
                       
# functional shift keys (i.e. "DSP", "STO")   1   2   2   2   3    
  DSP   STO,RCL   STO,RCL   STO,RCL   GSB,STO,RCL    
# unmarked shifted fcns (DSP n, etc.)   10   20   16   20   33    
                       
# 3-key generic shifted A   1   5   3   3   4    
  DSP •   gold •,STO +-x÷   f FIX, f SCI, f ENG   f FIX, f SCI, f ENG   f FIX, f SCI, f ENG, g LBL    
# fcns per 3-key generic shifted A   10   10   10   10   10