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IBM PCjr
IBM PCjr with original "chiclet" keyboard, PCjr color display, and 64 KB memory expansion card
Manufacturer
Teledyne, Lewisburg, Tennessee
Type
Personal computer
Release date
March 1984; 40 years ago (1984-03)
Introductory price
US$1,269 (equivalent to $3,720 in 2023) with 128 KB memory and without monitor.
£800 (equivalent to £3,250 in 2023) w/o disk drive.
CA$1,900
Discontinued
March 1985
Units shipped
500,000
Operating system
IBM PC DOS 2.10
CPU
Intel 8088 @ 4.77 MHz
Memory
64 KB base
Removable storage
Cartridges, floppy discs
Display
12" TTL RGBI monitor, composite video out (TV); 160 × 200 and 320 × 200 at 16 colors, 640 × 200 at 4 colors
Graphics
Motorola 6845 CRTC, IBM custom Video Gate Array
Sound
Texas Instruments SN76489, PC speaker
Predecessor
IBM Personal Computer
Successor
IBM PS/1
The IBM PCjr (pronounced "PC junior") was a home computer produced and marketed by IBM from March 1984 to May 1985, intended as a lower-cost variant of the IBM PC with hardware capabilities better suited for video games, in order to compete more directly with other home computers such as the Apple II and Commodore 64.
It retained the IBM PC's 8088 CPU and BIOS interface, but provided enhanced graphics and sound, ROM cartridge slots, built-in joystick ports, and an infrared wireless keyboard. The PCjr supported expansion via "sidecar" modules, which could be attached to the side of the unit.
Despite widespread anticipation, the PCjr was ultimately unsuccessful in the market. It was only partially IBM compatible, limiting support for IBM's software library, its chiclet keyboard was widely criticized for its poor quality, expandability was limited, and it was initially offered with a maximum of 128 KB of RAM, insufficient for many PC programs.
The IBMPCjr (pronounced "PC junior") was a home computer produced and marketed by IBM from March 1984 to May 1985, intended as a lower-cost variant of...
Model 5150 (IBM PC) in 1981. IBM released four different versions of the Microsoft BASIC interpreter, licensed from Microsoft for the PC and PCjr. They are...
standard for the Tandy 1000 series of IBM PC compatibles, which has compatibility with the video subsystem of the IBMPCjr but became a standard in its own...
Designed in Japan, it was based on the technology of the IBMPCjr and was designated the IBM 5511. It was targeted in the Australasian market towards...
The original IBM Personal Computer and IBMPCjr included support for storing data and programs on compact cassette tape. It was common for home computers...
adventure game that Sierra and IBM wished to market in order to attract consumers to IBM's lower-cost home computer, the IBMPCjr. AGI was capable of running...
The IBM Personal Computer, commonly known as the IBM PC, spanned multiple models in its first generation (including the PCjr, the Portable PC, the XT,...
half-height floppy drives and the new IBMPCjr. In 1983, Compaq released the Compaq Portable, the first 100% IBM PC compatible and licensed their own OEM...
game was ported to the Commodore 64, Atari 8-bit computers, MSX, IBM PC, and IBMPCjr. Juno First presents a set number of enemies per level, but they...
faster and more reliable digital transmission. 1983: IBMPCjr. IBM announces the widely anticipated PCjr., an attempt to enter the home computing marketplace...
State Command Modules and were not directly mapped to the system bus) and IBMPCjr (where the cartridge was mapped into BIOS space). Some arcade system boards...
The IBM Personal Computer (model 5150, commonly known as the IBM PC) is the first microcomputer released in the IBM PC model line and the basis for the...
The IBM Personal Computer AT (model 5170, abbreviated as IBM AT or PC/AT) was released in 1984 as the fourth model in the IBM Personal Computer line,...
instructions—1983. IBM 5155: IBM Portable—1984 IBM 4860: IBMPCjr—1984 IBM 5170: IBM Personal Computer/AT—1984 IBM 5140: IBM Convertible—1986 IBM 5281: IBM 3270 PC...
"fast RAM" if it was available. IBMPCjr Video memory Shared memory, in general, other than graphics PC Magazine Definition for SMA IBMPCjr information...
until IBM moved into the "personal computing" market in 1981."". Lowendmac.com. 25 September 2006. Retrieved 2013-04-09. "IBMPCjr". "IBMPCjr". "Commodore...
games and home computers (such as the TI-99/4A, BBC Micro, ColecoVision, IBMPCjr, Tomy Tutor, Sega Master System, Sega Game Gear, and Tandy 1000), competing...
interrupts. The IBMPCjr using the Video Gate Array graphics chip supported a 'vertical retrace interrupt' implemented as IRQ5. Later in 1984, IBM introduced...
and built-in sound capabilities of the IBMPCjr and Tandy 1000, what could be done with sound and music on the IBM PC changed dramatically. Two of the companies...
maker of TRS-80 computers, said about the new IBMPCjr: "I'm sure a lot of people will be coming out with PCjr look-alikes. The market is big." While preparing...
adapted to the IBM with the addition of another button on the back of the case. When IBM finally did release a joystick, for the IBMPCjr, it was a version...
on the IBM PC as "atrocious" upon seeing the completed game running for the first time. Adventure in Serenia was a launch title for the IBMPCjr, announced...
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