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I don't know about the 86 specificly, but earlier TIs (57?) used ROM 
cartridges for specialized programs. I had one that did navigation and 
piloting calculations,
including sight reductions.
One great thing about it was the documentation. Each function had a section in 
the book that stated the algorithm in use, and gave sample forms for 
recording data
to enter in the program. The sight reduction program would store a series of 
sights in RAM and automatically move them to the latest for a running fix, if 
you gave it
the DR info.
On Fri, 29 Oct 1999 21:50:43 GMT, Barry Colman wrote:
>On Thu, 28 Oct 1999 21:50:46 EDT, you wrote:
>
>>I have not seen this program, but...
>>
>>The biggest problem with the navigation programs that I have written for the
>>TI calculators is that their memory is RAM.  The programs can be erased.
>>That said, care in keeping good batteries in the calculator and avoiding
>>clearing the memory from the keyboard will prevent erasing the memory.  A
>>short program can be easily re-entered from the keypad.  A longer one will
>>take too long to punch in and is most easily downloaded from disk through a
>>PC using a TI-Graphlink.
>>
>>Bill Murdoch
>
>
>
>  I checked their website and I believe it is ROM..(I think that is
>their selling point..!!)
>
>
>
>                                Barry
>

   

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