IBM Portable Personal Computer

The IBM Personal Computer 5155 Model 68 was a laptop developed by IBM after the success of the Compaq Portable Suitcase. It was released in February 1984 and was eventually replaced by IBM Convertible.

The laptop was essentially a PC / XT motherboard, transplanted into a compaq-style compressive package. The system had 256 kilobytes of memory (expandable to 512 KB on the motherboard), an added CGA card connected to a monochrome amber internal composite monitor, and one or two 360 KB floppy drives. Unlike the Compaq Portable, which used a two-mode monitor and a special display card, IBM used a stock CGA card and a 9 “amber monochrome composite monitor, which had lower resolution, but could display colors. if it is connected to an external monitor or a TV A separate keyboard and 83-key cable have been provided Experts said IBM developed the Notebook partly because its sales force needed a computer that would compete with the Compaq Portable.If less sophisticated than the Compaq, the IBM had the advantage of a lower price tag.The motherboard had eight expansion slots.The power supply was evaluated 114 watts and was adapted to run on 120 or 230 VAC.Hard drives were a very common third-party add-on because IBM did not offer them from the factory.Usually in a two-drive context, the drive floppy disk A: running the operating system and drive B: was used for application and data disks. His point of sale as a “laptop” was that he combined the monitor into a basic unit that approximated a medium-sized suitcase that could simply be placed on its flat, plugged-in side, the keyboard folded or detached, and Started for use, although printers at the time, if necessary, tended to be less “portable”.

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