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Your best bet would be trying a math package on ti-calc.org - you can usually find something that does what you want there. You'll need a cable and the software to download these programs to your calculator. Here's a link to the trig section:
Here is a link to Ticalc.org where you can find programs that do prime factorization. You should read the description of each program to find out if it answers your questions. Using a program from Ticalc.org is under your entire responsibility.
Hi, Any connectivity software for the Yexas Instruments cakculators is downloadable from the TI Support web site. Among the various versions available, I have not seen any relating to the TI81. However, it is possible that the TI Connect software can be used. I do not vouch for that. I have no TI81 to test it on. Here is the link for all available connectivity software . If none works for you, I suggest you visit the ticalc.org archives. You might be lucky.
If it's a newer OS some commands may have changes and those games would no longer work... Since games don't get updated often I cannot say where you can go to find games that will work... but ticalc.org has the best archive of information/game/programs for everything...
This probably is not a problem with your calculator. A syntax error is caused by the program you are running. It just means that the game you have downloaded has a bug in the code and is unplayable. Check out TiCalc.org for a lot of working games and programs.