The IBM Portable Personal Computer 5155 model 68 was an early portable computer developed by IBM after the success of Compaq's suitcase-size portable machine (the Compaq Portable). It was released in February, 1984, and was eventually replaced by the IBM Convertible.
The Portable was basically a PC/XT motherboard, transplanted into a Compaq-style luggable case. The system featured 256 kilobytes of memory (expandable to 512 KiB), an added CGA card connected to an internal monochrome (amber) composite monitor, and one or two half-height 5.25" 360K floppy disk drives. Unlike the Compaq Portable, which used a dual-mode monitor and special display card, IBM used a stock CGA board and a 5" amber monochrome composite monitor, which had lower resolution. It could however, display color if connected to an external monitor or television. If a bit less sophisticated than the Compaq Portable, IBM's machine had the advantage of a lower price tag. Hard disks were a very common third-party add-on as IBM did not offer them from the factory.
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