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An
Example of What Happens When the Number of Keyboard Keys Goes UP |
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And the Number of Shifts
Goes DOWN: The HP67 versus the HP97 |
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HP 67 |
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HP 97 |
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tot # keys |
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35 |
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56 |
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# generic shift keys (i.e. "f", "g") |
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3 |
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1 |
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f, g, h |
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f |
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# marked generically-shifted fcns (f
ASIN, etc.) |
75 |
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52 |
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# unmarked generically-shifted fcns
(f·¹ ASIN) |
0 |
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0 |
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# functional shift keys (i.e. "DSP", "STO") |
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4 |
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6 |
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STO, RCL, DSP, GTO |
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LBL, GTO, GSB, STO, RCL, DSP |
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# unmarked shifted fcns (DSP n, etc.) |
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59 |
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92 |
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# 3-key shifted A |
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3 |
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1 |
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SF, CF, F? 0-3 |
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DSZ (i), ISZ (i) |
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# fcns per 3-key shifted A |
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4 |
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2 |
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# 3-key sequences B |
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1 |
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3 |
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GTO f a-e |
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LBL f, GTO f, GSB f |
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# fcns per 3-key seq B |
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5 |
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5 |
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# 3-key sequences C |
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1 |
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3 |
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f LBL 0-9 A-E, g LBLf a-e |
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f STF, f CLF, f F? |
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# fcns per 3-key seq C |
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20 |
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4 |
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# 3-key sequences D |
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4 |
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4 |
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STO + - x ÷ 0-9, (i) |
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STO +, STO -, STO x, STO ÷ |
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# fcns per 3-key seq D |
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11 |
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11 |
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# 3-key sequences E |
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1 |
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f GSB 0-9,A-E,(i), g GSBf a-e |
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# fcns per 3-key seq E |
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21 |
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# primary keys |
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32 |
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55 |
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tot # keys - tot # shift keys |
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tot # primary fcns |
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27 |
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47 |
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# primary keys - # functional shift
keys |
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tot # shift keys |
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7 |
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7 |
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# generic shift keys + # functional
shift keys |
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tot # 2-key shifted fcns |
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134 |
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144 |
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# marked shifted fcns + # unmarked
shifted fcns |
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tot # 3-key sequences |
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102 |
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73 |
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(# 3-key sequences A * #
fcns per 3-key seq A) + (# 3-key sequences B * # fcns per 3-key seq B)+…+( E) |
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tot # functions |
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263 |
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264 |
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# primary keys + tot # 2-key shifted
functions + tot # 3-key sequences |
(Only the non-programmable PRINT
PRGM added to HP97) |
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Keyboard Clutter (# fcns per key) |
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3.257 |
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1.964 |
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tot # fcns on keyboard / tot # keys |
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Keystroke Count |
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601 |
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554 |
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# primary keys + (2 * tot # shifted
functions) + (3 * tot # 3-key sequences) |
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Keystroke count per function |
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2.285 |
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2.098 |
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Keystroke count / total # functions |
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Ref: 65 Notes V4N1P8 |
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Detailed
HP67 Keyboard Metrics
Detailed HP97 Keyboard Metrics |
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