IBM Portable Personal Computer

IBM Portable PC 5155 model 68
	An IBM Portable PC with two 5.25-inch floppy diskette drives installed
Developer	IBM
Type	Portable computer
Release date	February 1984; 40 years ago
Introductory price	US$4,225 (equivalent to $12,390 in 2023)
Discontinued	April 1986
Operating system	IBM PC DOS Version 2.10 (disk)
CPU	Intel 8088 @ 4.77 MHz
Memory	256 KB (expandable to 640 KB)
Storage	One or two half-height 5+1⁄4-inch 360 KB floppy disk drives
Display	CGA card connected to an internal 9-inch monochrome (amber) composite monitor
Mass	30 pounds (13.6 kg)
Predecessor	IBM Personal Computer
Successor	IBM PC Convertible

The IBM Portable Personal Computer 5155 model 68 is an early portable computer developed by IBM after the success of the suitcase-size Compaq Portable. It was released in February 1984 and was quickly replaced by the IBM Convertible, only roughly two years after its debut.

Design

The Portable was basically a PC/XT motherboard, transplanted into a Compaq-style luggable case. The system featured 256 kilobytes of memory (expandable to 640 KB), an added CGA card connected to an internal monochrome amber composite monitor, and one or two half-height 5+1⁄4-inch 360 KB floppy disk drives, manufactured by Qume. Unlike the Compaq Portable, which used a dual-mode monitor and special display card, IBM used a stock CGA card and a 9-inch amber monochrome composite monitor, which had lower resolution. It could, however, display color if connected to an external monitor or television. A separate 83-key keyboard and cable was provided, which uses a front panel mounted phone jack styled connector RJ11. The cable from the connector then went to the back of the machine, where the original XT keyboard jack was.

Experts ^[who?] stated that IBM developed the Portable in part because its sales force needed a computer that would compete against the Compaq Portable.^[2] 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 rated 114 watts and was suitable for operation on either 115 or 230 VAC.^[1] Hard disks were a very common third-party add-on as IBM did not offer them from the factory.^[1] Typically in a two-drive context, floppy drive A: ran the operating system, and drive B: would be used for application and data diskettes.

Its selling point as a "portable" was that it combined the monitor into a base unit approximating a medium-sized suitcase that could be simply set on its flat side, the back panel slid away to reveal the power connector, plugged in, the keyboard folded down or detached, and booted up for use, though printers at the time, if needed, still tended to be less "portable". At thirty pounds, it may have been difficult to carry for some, and was often referred to as "luggable".

Timeline

Timeline of the IBM Personal Computer v t e

Asterisk (*) denotes a model released in Japan only

References

^ ^a ^b ^c Scott Mueller, Upgrading and Repairing PCs, Second Edition, Que, 1992 ISBN 0-88022-856-3 pp. 76–81
^ Rosenberg, Ronald (1984-02-28). "Doubts Raised About PCjr". The Boston Globe.

Notes

IBM (1984). Personal Computer Hardware Reference Library: Guide to Operations, Portable Personal Computer. IBM Part Numbers 6936571 and 1502332.

External links

[MUELLER2ND-1] Scott Mueller, Upgrading and Repairing PCs, Second Edition, Que, 1992 ISBN 0-88022-856-3 pp. 76–81

[rosenberg19840228-2] Rosenberg, Ronald (1984-02-28). "Doubts Raised About PCjr". The Boston Globe.

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[2]