IBM Portable Personal Computer
| Company type | Product model |
|---|---|
| Industry | Computer hardware |
| Founded | February 1984 |
| Successor | IBM Convertible |
| Products | Portable personal computer |
The IBM Portable Personal Computer 5155 model 68 represents one of IBM's initial ventures into the portable computing market, launched shortly after the success of the suitcase-style Compaq Portable. Introduced in February 1984, this model was succeeded by the IBM Convertible approximately two years later.
Design
This Portable model utilized an IBM Personal Computer XT motherboard enclosed within a carrying case reminiscent of Compaq’s design. It came equipped with 256 KB of RAM, expandable up to 640 KB, and featured a Color Graphics Adapter card connected to an integrated 9-inch amber monochrome composite display. Storage options included one or two half-height -inch 360 KB floppy drives manufactured by Qume. Unlike the Compaq Portable’s dual-mode display, IBM opted for a standard CGA card paired with a lower-resolution internal screen; however, color output could be achieved through an external monitor or television. The system employed a distinct 83-key keyboard that interfaced via an RJ11-style phone jack located on the front panel.
IBM created this Portable model in part to rival Compaq’s presence in the portable computer sector. Although based on the IBM PC XT architecture, it exhibited slightly less compatibility with the original IBM PC compared to Compaq’s device, yet it was offered at a more affordable price point. The motherboard featured eight expansion slots, while the power supply supported both 115 and 230 VAC at a power rating of 114 watts. Hard drives were commonly added as third-party enhancements since IBM did not provide factory-installed disk drives. Typically, drive A: contained the operating system, with drive B: used for applications and data storage.
Promoted as a "portable" computer, this unit integrated both the display and base components into a suitcase-like enclosure that could be laid flat during operation. The rear panel slid open to allow power connection, and the keyboard could either fold down or be detached for easier transportation. Weighing approximately thirty pounds, it was frequently described as "luggable," highlighting its limited portability relative to contemporary standards.
References
- Notes
- IBM (1984). Personal Computer Hardware Reference Library: Guide to Operations, Portable Personal Computer. IBM Part Numbers 6936571 and 1502332.