The IBM PCjr (PC junior) was introduced in early 1984 and was an attempt by IBM to enter the home computer market.
It was not fully compatible with the existing IBM PC, and much software written for the PC did not run on the PCjr, but it did offer built-in colour graphics and 3 voice sound, along with a wireless infra-red keyboard, the ability to use a TV set as a monitor, two joystick ports and two ROM cartridge ports. Plugging in a cartridge caused the PCjr to reboot automatically and run the software. Data could be saved via a 5.25-inch floppy disk drive (only included in the more expensive model).
Sales were slower than expected. One reason given was the inferior ‘chiclet’ keyboard, which made typing difficult (although IBM changed the keyboard in July). Another reason was it’s cost, which was twice as much as a Commodore 64. Through expensive advertising and lower prices, sales picked up during Christmas 1984, but fell sharply afterwards and it was discontinued by March 1985.