Programming Languages: TI-85 vs. TI-84 CE Plus
I purchased a
1995 edition of the TI-85 at a Pasadena City College swap meet. The TI-85 was my go-to and favorite calculator
through high school (1991 – 1995).
Today, I am
going to compare common programming commands between two of my favorite Texas
Instrument calculators, the TI-85 and the current TI-84 CE Plus. The manuals for each calculator were
consulted to answer questions.
Arguments in
vector brackets [ ] means the argument is optional.
Command
|
TI-85 (1992 – 1997)
(probably also applies to the TI-86)
Software Version 10.0
|
TI-84 CE Plus (2016-)
(most of the this applies to TI-84
Plus 2004-present)
Software Version 5.2.2
|
Variable
Names
|
Up to 8
characters, must begin with a number, no spaces.
All variables
are global.
|
Single
letters A through Z, n, θ
All variables
are global.
|
Complex
Number display, Rectangular
|
(X, Y)
|
X + Yi
|
Complex
Number display, Polar
|
(R ∠ θ)
|
R e^θi
|
Graphing
Modes
|
Function,
Polar, Parametric, Differential Equation
|
Function,
Polar, Parametric, Recurring Sequences
|
Number of
Colors
|
0 (monochrome
display)
|
15: blue,
red, black, magenta, green, orange, brown, navy, light blue, yellow, white,
light gray, medium gray, gray, dark gray (backlit display)
**CE and C
versions only
|
Input
|
Input by
itself displays the graph screen
Input [“prompt string”], varname
|
Input by
itself displays the graph screen
Input [“prompt
string”], variable
|
Prompt: asking for and storing multiple values
|
Prompt var1, var2, var3 ,…
|
Prompt var1, var2, var3, …
|
Disp
|
Disp by
itself displays the home screen
Disp var/string, [var/string …]
|
Disp by
itself displays the home screen
Disp var/string, [var/string…]
|
Pause
|
Pause [var/string]
|
Pause [var/string], [time in seconds]
|
Wait
|
N/A
|
Wait time in seconds up to 100
|
Display the graph
screen
|
DispG
displays the
graph screen
|
DispGraph
displays the
graph screen
|
Display the
function table
|
N/A
|
DispTable
|
Output
|
Outpt(line, col, var/string)
8 lines, 21
columns
|
Output(row, col, var/string)
10 rows, 26
columns
|
InpSt
|
InpSt stores entered
text or equations as strings
|
N/A. Use Input
|
If – Then –
Else structure
|
If condition
Then
do if true
[Else
do if false]
End
|
If condition
Then
do if true
[Else
do if false]
End
|
For structure
|
For(var,
begin, end, [step])
commands
End
|
For(var,
begin, end, [step])
commands
End
|
While
structure
|
While condition
do while condition is true
End
|
While condition
do while condition is true
End
|
Repeat –
Until structure
|
Repeat condition
do while condition is false
End
|
Repeat condition
do while condition is false
End
|
Menu
|
Menu(nn, string, label…)
Where nn is
from 1 to 15
|
Menu(“title”, “text”, label…)
Up to 9
options
|
Labels
(Lbl/Goto)
|
Label names
can have up to 8 characters. All
labels are local.
|
A-Z, 0 -99, θ. All labels are local.
|
Increment (by
1) and Skip (if greater to value)
|
IS>(variable, value)
|
IS>(variable, value)
|
Decrement (by
1) and Skip (if less than value)
|
DS<(variable, value)
|
DS<(variable, value)
|
Stop program
execution
|
Stop
|
Stop
|
Return from a
subroutine
|
Return
|
Return
|
Execute a
subroutine
|
Type the name
of the program
|
Call program
by pressing [prgm], choosing it from the Program submenu during editing
|
Clear the
graph screen
|
ClDrw (clear
all drawings)
|
ClrDraw
(clear all drawings)
|
Display text
on a graph screen
|
N/A
|
TextColor(color) sets the color.
Text([-1], row, col, string)
0-164 row
pixel,
0-264 column
pixel
-1 is for large text
|
Draw a
temporary function
|
DrawF f(x)
|
DrawF f(x), [color]
|
Draw a
temporary inverse function (f^-1(x) = y, x and y are swapped)
|
DrInv f(x)
|
DrawInv f(x), [color]
|
Shading
|
Shade (lower, upper, left, right)
|
Shade (lower, upper, [left, right, pattern,
pattern resolution, color])
|
Draw a line
|
Line(x1, y1, x2, y2)
|
Line(x1, y1, x2, y2, [0/1, color, line style])
0/1: 0 to
erase, 1 to draw
|
Draw a circle
|
Circle(x, y, radius)
|
Circle(x, y, radius, [color, line style])
|
Draw a Point
Only the
TI-84 Plus CE has similar commands for pixels
|
PtOn(x,y)
PtOff(x,y)
PtChg(x,y)
|
Pt-On(x,y, [mark, color])
Pt-Off(x,y,[mark])
Pt-Change(x,y,[color])
|
Convert a
value to a string
|
N/A
|
eval(expression) → Str#
No complex
results
|
Convert a
string to a value
|
N/A
|
expr(string)
|
Convert a
string to a graph variable
|
St>Eq(string, graph variable)
|
String>Equ(string, graph variable)
|
Length of a
string
|
lngth string
|
length(string)
(call from
the catalog)
|
Extract part
of a string
|
sub(string, begin point, length)
|
sub(string, begin point, length)
(call from
the catalog)
|
Execute
Linear Regression analysis (other regressions are similar)
|
LinR xlist, ylist
|
LinReg(ax+b) xlist, ylist, [freqlist, Y= variable]
|
Turn a stat
plot on
|
N/A (stat
plots are not available on the TI-85)
|
PlotsOn [1,2,3]
|
Turn a stat
plot off
|
N/A (stat
plots are not available on the TI-85)
|
PlotsOff [1,2,3]
|
Turn graph
functions on
|
FnOn [1 – 99]
|
FnOn [1-9, 0]
|
Turn graph
functions off
|
FnOff [1 – 99]
|
FnOff [1-9, 0]
|
Notes
As we can see,
the programming language of the TI-85/86 family is similar to the TI-84 Plus
family, translating the programs should not be difficult. I believe that stat plots are available on
the TI-86, but not the TI-85.
Keep in mind if
you have complex numbers, that the complex mode on the TI-84 Plus (a+bi or re^(θi)
has to be turned on. Furthermore,
logarithmic, power, exponential, and trigonometric functions for complex numbers
return error on the TI-84 Plus (substitute expressions must be used).
(use radians
mode)
With z = X + Yi
= R*e^(θ*i), X = real(z), Y = imag(z), R = abs(z), θ = arg(z)
z^n = R^n *
(cos(n*θ) + sin(n*θ)*i), n is a real number
ln (z) = ln R +
θ*i
e^(z) = e^X *
cos Y + e^X * sin Y * i
sin(z) = sin X
* cosh Y + cos X * sinh Y * i
cos(z) = cos X
* cosh Y – sin X * sinh Y * i
sin¯¹ (z) =
asin(z) = -i * ln (zi ± √ (1 – z^2)
z1 ^ z2 = e^(z2
* ln z1)
Eddie
This blog is
property of Edward Shore, 2017
