While IANAL, TI has not objected to emulators in the past; there are third-party freeware emulators available for all of their calculators (including the older 83&#x2F;84 series, the 68K calculators, and the Nspire).<p>TI&#x27;s legal department has tended to draw the line at two points:  they don&#x27;t like illegal copying of their ROMs (so, while they haven&#x27;t objected to tools which pull a ROM off a real calculator you have in your physical possession, they will send takedown notices if you post those results publicly), and they&#x27;ve become pretty aggressive in working against anything that compromises the integrity of the OS on a physical calculator (because they don&#x27;t want push-to-test features compromised).  Just about anything else goes (and is occasionally encouraged).