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HandWiki. Atari Portfolio. Encyclopedia. Available online: (accessed on 23 June 2024).
HandWiki. Atari Portfolio. Encyclopedia. Available at: Accessed June 23, 2024.
HandWiki. "Atari Portfolio" Encyclopedia, (accessed June 23, 2024).
HandWiki. (2022, November 07). Atari Portfolio. In Encyclopedia.
HandWiki. "Atari Portfolio." Encyclopedia. Web. 07 November, 2022.
Atari Portfolio

The Atari Portfolio (Atari PC Folio) is an IBM PC-compatible palmtop PC, released by Atari Corporation in June 1989. This makes it the world's first palmtop computer.

palmtop portfolio folio

1. History

DIP Research Ltd. based in Guildford, Surrey, UK released a product in the UK called the DIP Pocket PC in 1989. Soon after its release, DIP licensed this product to Atari for sale as the Portfolio in the UK and US.[1] In Italy, Spain and Germany, it was originally marketed as PC Folio instead.[2] DIP officially stood for "Distributed Information Processing", although secretly it actually stood for "David, Ian and Peter", the three founding members of the company who were former employees of Psion.[1] The original founder of the company (first called "Crushproof Software") was Ian H. S. Cullimore, and the other two David Frodsham and Peter Baldwin.[3] Cullimore was involved in designing the early Organiser products at Psion before the DIP Pocket PC project. The technologic successor of the Portfolio was the also DIP-developed Sharp PC-3000/3100. DIP Research was later acquired by Phoenix Technologies in 1994.[4]

2. Technology

Screenshot of DIP-DOS 2.11 in action.

The Portfolio uses an Intel 80C88 CPU running at 4.9152 MHz and runs "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 DOS 3.xx. It has 128 KB of RAM and 256 KB of ROM which contains 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 has 15360 240 × 64 pixels or 40 characters × 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 (120 V: HPC-401, 230 V: HPC-402).[5]

There is an expansion port on the right side of the computer for parallel (HPC-101), serial (HPC-102), modem or MIDI expansion modules. It uses a Bee Card expansion port for removable memory (aka Credit Card Memory or CCM), which is not compatible with PC card as it predated that standard. 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.[6]

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").

3. Versions

  • Atari Portfolio HPC-003: ROM version 1.052[7]
  • Atari Portfolio HPC-004: ROM version 1.056
  • Atari Portfolio HPC-005: ROM version 1.130
  • Atari Portfolio HPC-006: ROM version 1.072[8]
  • 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

Template:Anchor (or Anchors): too many anchors, maximum is ten

4. Accessories

  • Atari HPC-101 Smart parallel interface
  • Atari HPC-102 Serial interface
  • Atari HPC-103 Memory expansion
  • Atari HPC-104 Memory expander+
  • Atari HPC-201 Memory card 32 KB
  • Atari HPC-202 Memory card 64 KB
  • Atari HPC-203 Memory card 128 KB
  • Atari HPC-204 OTPROM card 512 KBit
  • Atari HPC-205 OTPROM card 1 MBit
  • Atari HPC-301 PC Card drive for PC ISA bus
  • Atari HPC-401 Mains adapter 110 V
  • Atari HPC-402 Mains adapter 220 V
  • Atari HPC-406 Parallel cable
  • Atari HPC-407 Serial cable
  • Atari HPC-408 Parallel printer cable
  • Atari HPC-409 Null modem cable
  • Atari HPC-501 OTPROM adapter 512 KBit
  • Atari HPC-502 OTPROM adapter 1 MBit
  • Atari HPC-701 ROM card "Utility"
  • Atari HPC-702 ROM card "Finance"
  • Atari HPC-703 ROM card "Science"
  • Atari HPC-704 ROM card "File Manager"
  • Atari HPC-705 ROM card "Power BASIC"
  • Atari HPC-709 ROM card "Instant Spell"
  • Atari HPC-711 ROM card "U.S. Traveller's Guide)"
  • Atari HPC-713 ROM card "Hyperlist"
  • Atari HPC-715 ROM card "Language Translator"
  • Atari HPC-724 ROM card "Bridge Baron"
  • Atari HPC-725 ROM card "Wine Companion"
  • Atari HPC-726 ROM card "Diet / Cholesterol Counter"
  • Atari HPC-728 ROM card "Astrologer"
  • Atari HPC-729 ROM card "Stock Tracker"
  • Atari HPC-750 ROM card "Chess"
  • Atari HPC-803 Portfolio system case

5. In Popular Culture

The Atari Portfolio was used by the character John Connor to crack PINs in two scenes in the 1991 film Terminator 2: Judgment Day.

6. Gallery


  1. Image of Original DIP Pocket PC
  2. "Atari PC Folio". 
  3. Atari's Portfolio: the world's first palmtop, By Tony Smith, 2007-06-07, reghardware
  4. "Phoenix Technologies acquire DIP Research". CBR. 11 July 1994. 
  5. "About Atari Portfolio" ,
  6. page with a picture of the modem expansion module
  7. "Picture of a PC Portfolio".$/ATARI-Portfolio-OVP-Netzteil-Parallel-_57.jpg. 
  8. Gleason, BJ. "Portfolio Frequently Asked Questions, PORT.FAQ". 
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