The following features have been implemented:
---------------------------------------------

  number entry
    0         yes
    1         yes
    2         yes
    3         yes
    4         yes
    5         yes
    6         yes
    7         yes
    8         yes
    9         yes
    .         yes
    equals    yes
    AC        yes
    C         yes
    +/-       yes
    A         no
    B         no
    C         no
    D         no
    E         no
    F         no
  operations
    +         yes
    -         yes
    x         yes
    /         yes
    k         no
  memory and registers
    X<->Y     no
    X<->M     no
    M+        no
    M-        no
    Min       no
    MR        no    
  brackets
    [(...     no
    ...)]     no    
  percent
    sh-equals no    
  fractions
    ' ' ''    no
    !' ' ''   no
    a b/c     no
    R<->P     no
    P<->R     no    
  stats
    sh-AC     no
    mode-.    no
    DEL       no
    !x        no
    sn        no
    sn-1      no
    xD        no
    Sx^2      no
    Sx        no
    n         no    
  constants
    sh-1      yes
    sh-2      yes
    sh-3      yes
    sh-4      yes
    sh-5      yes
    sh-6      yes
    sh-7      yes
    sh-8      yes
    sh-9      yes
    sh-+      yes
    sh--      no
    sh-x      no
    sh-/      no
    exp-pi    yes
  random number generator
    sh-.      yes
    sh-0      no
  exps
    exp       yes
    eng       no
    !eng      no
    mode-7    no
    mode-8    no
    mode-9    no
  computing
    NEG       no
    NOT       no
    AND       no
    OR        no
    XOR       no
    XNOR      no
  bases
    mode-0    no
    mode-1    no
    mode-2    no
    mode-3    no
  logarithms
    log       no
    ln        no
  powers
    x^y       no
    x^1/y     no
    e^x       no
    10^x      no
    x^2       no
    sqrt      no
    cbrt      no
    1/x       no
    x!        no
  calculus
    mode-4    no
    mode-5    no
    mode-6    no
    sin       no
    cos       no
    tan       no
    sh-sin    no
    sh-cos    no
    sh-tan    no
    sin-1     no
    sh-sin-1  no
    cos-1     no
    sh-cos-1  no
    tan-1     no
    sh-tan-1  no
  conversions
    'F='C     no
    in=mm     no
    gal=l     no
    lb=kg     no
    oz=g      no
    cal=J     no
    mmHg=kPa  no
    atm=MPa   no


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