Expansion cards were available in sizes of 32 KB (HPC-201), 64 KB (HPC-202), and 128 KB (HPC-203) initially, and later were available in capacities up to 4 MB. The expansion cards were backed up by a replaceable battery, which last approximately two years. Built-in applications include a text editor, spreadsheet (Lotus 1-2-3 compatible), phone book and time manager. Expansion cards contain programs such as a chess game (HPC-750), a file manager (HPC-704), and a finance manager (HPC-702). Most text-based DOS applications can run on the Portfolio as long as they did not directly access the hardware and could fit into the small memory. Other expansion modules include a floppy drive, and a memory expansion unit (HPC-104). The memory expansion unit gives the Portfolio an additional 256 KB of RAM, which can be partitioned into several drives. It also features a pass-through expansion connector, allowing the use of more than one expansion unit. In theory, multiple memory expanders can be attached, increasing the available storage to over 640 KB. A card reader (HPC-301) connects to a desktop PC to read and write to the expansion cards. The kit contains an ISA card, a special cable, the card reader, and software distributed on floppy disk. A modem expansion module converts the portfolio into a miniature computer terminal. The modem is powered from the portfolio and came with an acoustic coupler consisting of two round shells that could be mounted over both ends of a handset with the aid of velcro strips. A direct connection to a telephone with a standard telephone lead is also possible. The complete terminal and coupler are portable, weighing only a few hundred grams. Also, using the parallel port expansion module (HPC-101), a standard parallel cable and the software supplied (DOS based), the Portfolio can be connected to a PC for transferring files to and from the unit. Credits for the development of the product can be found in an easter egg if one selects Setup, then Help, and then presses + ("Alt" plus "left square bracket"). Versions Atari Portfolio HPC-003: ROM version 1.052 Atari Portfolio HPC-004: ROM version 1.056 Atari Portfolio HPC-005: ROM version 1.130 Atari Portfolio HPC-006: ROM version 1.072 Atari Portfolio HPC-007: ROM version 1.130 Atari PC Folio HPC-008: ROM version 1.130 Atari Portfolio HPC-009: ROM version 1.130? Atari Portfolio HPC-010: ROM version 1.130? Atari Portfolio HPC-011: ROM version 1.130?, 512 KB Accessories Atari HPC-101