Technology
The Portfolio uses an Intel 80C88 CPU running at 4.9152 MHz and ran "DIP Operating System 2.11" (DIP DOS), an operating system mostly compatible to MS-DOS 2.11, but with some DOS 2.xx functionality lacking and some internal data structures more compatible with MS-DOS 3.xx. It had 128 kB of RAM and 256 kB of ROM which contained the OS and built-in applications. The on-board RAM is divided between system memory and local storage (the C: drive). The LCD is monochrome without backlight and had 240x64 pixels or 40 characters x 8 lines.
Power is supplied by three AA size removable alkaline batteries. The computer's memory is preserved during battery changes. There is also an optional AC adapter.
There is an expansion port on the right side of the computer for parallel, serial, modem or MIDI expansion modules. It uses a BeeCard expansion port for removable memory, which is not compatible with PC card as it predated that standard. Expansion cards were available in sizes of 32, 64, and 128 kB 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 contained programs such as a chess game, a file manager, and a finance manager. Most text-based MS-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. 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.
There was also a card reader available that connected to a desktop PC to read and write to the expansion cards. The kit contained an ISA card, a special cable, the card reader, and software distributed on floppy disk.
A modem expansion module was available which 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 grammes.
Also, using the parallel port expansion module, 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+[ ("Alt" plus "left square bracket").
Read more about this topic: Atari Portfolio
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