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). A portable computer is a Computer that is designed to be moved from one place to another International Business Machines Corporation abbreviated IBM and nicknamed "Big Blue", is a multinational Computer Technology Compaq Computer Corporation was an American Personal computer company founded in 1982 and is now a brand name of Hewlett-Packard. The Compaq Portable was the first product in the Compaq portable series to be commercially available under the Compaq Computer Corporation brand. It was released in February, 1984, and was eventually replaced by the IBM Convertible. Year 1984 ( MCMLXXXIV) was a Leap year starting on Sunday (link displays the 1984 Gregorian calendar) The IBM PC Convertible released April 3, 1986, was IBM 's first Laptop computer and was also the first IBM computer to utilize the 3
The Portable was basically a PC/XT motherboard, transplanted into a Compaq-style luggable case. The IBM Personal Computer XT, often shortened to the IBM XT or simply XT, was IBM's successor to the original IBM PC. The system featured 256 kibibytes of memory (expandable to 640 KiB), an added CGA card connected to an internal monochrome (amber) composite monitor, and one or two half-height 5. A kibibyte (a contraction of ki lo bi nary byte) is a unit of Information or Computer storage, established by the International A composite monitor is any analog video display that receives input in the form of an analog Composite video signal through a single Cable — in contrast 25" 360K floppy disk drives. A floppy disk is an increasingly Obsolete data storage medium that is composed of a disk of thin flexible ("floppy" Magnetic storage medium encased Unlike the Compaq Portable, which used a dual-mode monitor and special display card, IBM used a stock CGA board and a composite monitor, which had lower resolution. The Compaq Portable was the first product in the Compaq portable series to be commercially available under the Compaq Computer Corporation brand. It could however, display color if connected to an external monitor or television.
The Portable was not a big seller due to the public's confusion over what it really was: It should have been called the Portable XT, which would have been more accurate. "Portable PC" implied the earlier PC technology, which led consumers to believe it was less advanced than it actually was.
The floppy controller card was the same as found in the IBM XT and supported up to four 360K drives (two internal, two external) but was not compatible with the higher-capacity drives then gaining in popularity, notably the 5. 25" quad-density ("1. 2MB") drives that were standard in the IBM AT and 3. The IBM Personal Computer/AT, more commonly known as the IBM AT and also sometimes called the PC AT or PC/AT, was IBM 's second-generation 5" 720K drives.
References
- IBM (1984). Personal Computer Hardware Reference Library: Guide to Operations, Portable Personal Computer. IBM Part Numbers 6936571 and 1502332.
External links
| IBM 5155 | ||
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| IBM 5150 | IBM 5140 | |
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