If you have an Android phone, you can get much higher-quality emulation of Texas Instruments calculators by installing Graph 89 (https://bitbucket.org/dhashoand

If you have an Android phone, you can get much higher-quality emulation of Texas Instruments calculators by installing Graph 89 (https://bitbucket.org/dhashoandroid/graph89-paid/src/master/ https://bitbucket.org/dhashoandroid/graph89-paid/src/master/ ; free on the Play Store at https://play.google.com/store/apps/details?id=com.Bisha.TI89Emu&gl=US https://play.google.com/store/apps/details?id=com.Bisha.TI89...) and ripping or downloading a ROM for your calculator model. There is also a more recently updated fork of Graph 89 that I haven’t tried: https://github.com/milaq/graph89 https://github.com/milaq/graph89. Compared to these new Internet Archive emulations such as https://archive.org/details/ti89-calculator https://archive.org/details/ti89-calculator, Graph 89 has these advantages: • less likely to drop quick inputs in succession • higher-resolution images of the calculator faces (example: https://github.com/milaq/graph89/blob/94c8c0d20044f478f6696628203bc98e2e96f804/app/src/main/assets/portrait/ti89tclassic/skin.jpg https://github.com/milaq/graph89/blob/94c8c0d20044f478f66966...) • highlights the button on the calculator’s face when you click it • allows loading programs into memory from separate files of the type you can download from https://ticalc.org/ https://ticalc.org/ • works offline, because it uses your offline copy of the calculator’s ROM