IBM PCjr

IBM PCjr. Introduced in late 1983, it was IBM's ambitious attempt to enter the burgeoning home computer market dominated by companies like Commodore and Apple. Marketed as a more affordable and user-friendly counterpart to the successful IBM Personal Computer, it featured several innovative but controversial design choices. Despite its advanced capabilities for a home machine, it was commercially unsuccessful and was discontinued in early 1985, leaving a notable legacy in the history of personal computing.

History and development

The project, internally codenamed "Peanut," was initiated by IBM in the early 1980s to create a product for the education and home computer markets. Development was led by a team in Boca Raton, separate from the division responsible for the IBM Personal Computer. Key figures, including Philip Don Estridge, were involved in its strategy, aiming to compete directly with machines like the Apple IIe and the Commodore 64. The design philosophy emphasized lowering costs and simplifying use, leading to decisions such as the integrated Chiclet keyboard and extensive use of ROM cartridges. Its announcement in late 1983 was met with significant anticipation within the technology industry.

Technical specifications

At its core, the system utilized an Intel 8088 microprocessor running at 4.77 MHz, identical to that in the original IBM Personal Computer. It initially shipped with 64 KB of RAM, expandable to 128 KB on the motherboard, with a unique sidecar expansion system allowing further upgrades. Graphics were provided by a modified CGA-compatible chip capable of 16 colors at lower resolutions, a notable improvement over the standard IBM Personal Computer. Sound was generated by a three-voice TI SN76496 PSG, offering superior audio to the PC speaker of its predecessor. Storage options included one or two 5.25-inch floppy disk drives and support for IBM PC DOS 2.10.

Models and variants

Two primary models were offered at launch. The base model, often called "PCjr 4860-004," came with 64 KB of RAM and no built-in storage, relying on cartridge-based software or an optional external disk drive. The more capable "PCjr 4860-067" featured 128 KB of RAM and a single internal 5.25-inch floppy drive. A short-lived third model, the "PCjr 4860-004 with 128 KB," was introduced later. IBM also produced various hardware bundles, including packages with a color monitor, replacement keyboard, and popular software titles from companies like Lotus and Electronic Arts.

Software and peripherals

Software support was a mix of cartridge-based programs and standard floppy disk titles compatible with IBM PC DOS. Notable cartridge titles included King's Quest from Sierra On-Line and Cartridge-BASIC. Many major IBM Personal Computer software publishers, such as Microsoft and Ashton-Tate, released versions of their products, including Multiplan and dBase II. Key peripherals included the infamous wireless "Chiclet keyboard," a numeric keypad, the "Sidecar" expansion module for adding parallel ports or more RAM, and a light pen for drawing. Compatibility with standard IBM Personal Computer peripherals was limited, a significant point of criticism.

Reception and legacy

Upon release, it received largely negative reviews from critics at publications like InfoWorld and BYTE, who panned its keyboard, limited expandability, and high price compared to rivals like the Commodore 64. Sales were dramatically below IBM's projections, hampered by initial production shortages and the lukewarm critical reception. Its commercial failure is often cited as a rare misstep for IBM during this period, contributing to the rise of more successful IBM PC compatible machines from companies like Compaq and Tandy. Despite its short lifespan, it influenced later designs, including the IBM PC Convertible, and remains a collectible item among enthusiasts of vintage computing. Category:Home computers Category:IBM personal computers Category:Discontinued products