The Portfolio comes with these built-in applications: diary, calculator, text editor, spreadsheet (Lotus 1-2-3 compatible), time, and address/phone book manager that has the ability to dial telephone numbers by playing touch-tones through the speaker. With the purchase of expansion, you could add programs like chess, file manager, and finance manager. Also, most text-based MS-DOS apps can run on the Portfolio. Another feature includes an expansion port for a parallel, serial, modem, or MIDI modules and a BeeCard expansion port for removable memory (in capacities up to 4 MB). You could add in other optional expansions units, like a floppy drive and memory expansion. With a modem connection module or a direct telephone connection the Portfolio converts into a miniature computer terminal. If connected to a PC by way of parallel cable files can be transferred between the two computers.
The Atari Portfolio is still popular today as some people value it strict simplicity. Also, several hacks have been put to use to update it, including a Flash modification. On a side note, at the peak of popularity, the Atari Portfolio appears in the movie Terminator 2: Judgment Day. In the movie, young John Carter uses it to bypass security codes on an ATM with a ribbon cable.