Motorola M500 Manuel d'utilisateur télécharger pdf (Page 3)

M500 180 Page 1

Developing a fractal program for a TI83 calculator

Patrick Meehan

This article will explain the procedure for developing programs for Texas

Instruments calculators using a personal computer. Thus, a user’s TI calcu-

lator eﬀectively becomes a target system. Although the target system used

in this article is a TI83, a similar procedure can be followed for other Texas

Instruments calculators, except for the TI80. The TI80 does not possess a

communications port. I hope this article will be of interest to MS221 stu-

dents, as the example fractal program is a conversion of a supplementary

MS221 MathCAD ﬁle, which produces a Barnsley fern.

First of all, we list the necessary equipment that will be needed: obvi-

ously a TI8x/92 calculator that will act as the target system; also a copy of

the Texas Instruments TI-Graph Link program, plus a serial communica-

tions lead in order to connect the calculator to a PC; a copy of Virtual TI;

and ﬁnally an assembler shell speciﬁc to a particular model of calculator.

What follows is a brief explanation of the above items and the role they

play in program development.

TI-Graph Link handles the communications between a PC (or Macin-

tosh) and a TI calculator. With this you can upload and download calcula-

tor programs between a PC and a TI calculator. Also TI-Graph Link allows

a user to enter calculator programs from within the program editing window.

To the left of the editing window is a copy of a TI calculator keypad. This

allows a user to enter single key-press commands such as store and other

menu based Basic commands. There is a diﬀerent version of TI-Graph Link

for each TI calculator model. A copy appropriate for a speciﬁc calculator

can be downloaded via the Internet at www.ti.com/calc/docs/calchome.html.

A view of the TI-Graph Link 83 screen is shown at the top of the next page.

You can purchase a computer kit called Graphlink 99 from Oxford Ed-

ucational Supplies. It includes a black communication cable. Their web

address is www.oxford-educational.co.uk. Supplied with Graphlink 99 is a

CD ROM, which contains the TI-Graph Link software for all models of TI

calculators.

Virtual TI is a TI calculator emulator that runs under Windows on a

PC. This software is freeware and can be downloaded from www.ticalc.org

as a ‘zip’ ﬁle. Finally, an assembler shell will be needed which has to be

uploaded on to the target TI calculator. For the TI83 this assembler shell

is called Ashell.83g. You can obtain an appropriate assembler shell from

www.ticalc.org or www.ti-ﬁles.org (download the ﬁle called TI83ashell.zip or

Ashell.zip and then extract using WinZip). There are diﬀerent assembler

shells for each model of calculator.

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Motorola M500 Manuel d'utilisateur Page 3