|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
HP18C |
|
HP17B |
|
|
|
|
|
|
|
|
|
|
tot # keys |
|
72 |
|
37 |
|
|
|
|
|
|
|
|
|
|
# generic shift keys (i.e. "f",
"g") |
|
1 |
|
1 |
|
|
|
|
|
|
gold |
|
gold |
|
|
|
|
|
# marked shifted fcns (f ASIN, etc.) |
|
36 |
|
9 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# unmarked shifted fcns (f·¹ ASIN) |
|
0 |
|
0 |
|
|
|
|
|
|
|
|
|
|
# functional
shift keys (i.e. "DSP", "STO") |
2 |
|
2 |
|
|
|
|
|
|
STO,RCL |
|
STO,RCL |
|
|
|
|
|
# unmarked shifted fcns (DSP n, etc.) |
|
8 |
|
20 |
|
|
|
|
|
|
|
|
|
|
# 3-key generic shifted A |
|
4 |
|
4 |
|
|
|
|
|
|
STO +-x÷ |
|
STO +-x÷ |
|
|
|
|
|
# fcns per 3-key generic shifted A |
|
4 |
|
10 |
|
|
|
|
|
|
|
|
|
|
# 4-key sequences B |
|
1 |
|
1 |
|
|
|
|
|
|
STO gold ^ |
|
STO gold y^x |
|
|
|
|
|
# fcns per 4-key seq B |
|
4 |
|
10 |
|
|
|
|
|
|
|
|
|
|
# menus |
|
23 |
|
30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# menu fcns |
|
125 |
|
237 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# primary keys |
|
69 |
|
34 |
|
tot # keys -
tot # shift keys |
|
|
|
|
|
|
|
|
|
|
tot # primary fcns |
|
62 |
|
27 |
|
# primary keys
- # functional shift keys |
|
|
|
|
|
|
|
|
|
|
tot # shift keys |
|
3 |
|
3 |
|
# generic
shift keys + # functional shift keys |
|
|
|
|
|
|
|
|
|
|
tot # 2-key shifted fcns |
|
44 |
|
29 |
|
# marked
shifted fcns + # unmarked shifted fcns |
|
|
|
|
|
|
|
|
|
|
tot # 3-key sequences |
|
16 |
|
40 |
|
(#
3-key sequences A * # fcns per 3-key seq A) |
|
|
|
|
|
|
|
|
|
|
|
|
|
tot # 4-key sequences |
|
4 |
|
10 |
|
(#
4-key sequences B * # fcns per 4-key seq B) |
|
|
|
|
|
|
|
|
|
|
|
|
|
# menu functions |
|
125 |
|
237 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
tot # Menu keystrokes |
|
278 |
|
569 |
|
|
|
|
|
|
|
|
|
|
|
|
tot # functions |
|
251 |
|
343 |
|
# primary keys
+ tot # 2-key shifted functions + tot # 3-key sequences |
|
|
|
|
|
|
|
|
|
|
Keyboard Clutter (# fcns per key) |
|
1.431 |
|
1.189 |
|
tot # fcns on
keyboard / tot # keys |
|
|
|
|
|
|
|
|
|
|
|
|
Keystroke Count |
|
492 |
|
814 |
|
# primary keys
+ (2 * tot # shifted functions) + (3 * tot # menu
functions) + (3 * tot # 3-key sequences) |
|
|
|
|
|
|
|
|
|
|
Keystroke count per function |
|
1.960 |
|
2.373 |
|
Keystroke
count / total # functions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Click here
for HP18C Detailed Keyboard
Metrics |
|
Click here
for HP17B Detailed
Keyboard
Metrics |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|