The Commodore Plus/4 is a home computer released by Commodore International in 1984. The “Plus/4” name refers to the four-application ROM resident office suite (word processor, spreadsheet, database, and graphing); it was billed as “the productivity computer with software built-in.”. Internally, the Plus/4 shared the same basic architecture as the lower-end Commodore 16 and 116 models, and was able to use software and peripherals designed for them. The Plus/4 was incompatible with the Commodore 64’s software and some of its hardware. Although the Commodore 64 was more established, the Plus/4 was aimed at the more business oriented part of the personal computer market.

Technical Specifications
CPU : Mos Tech 7501 @ 0.89 MHz or 1.76 MHz
ROM : 64 Kb
RAM : 64 Kb (59 Kb available)
Display : Television or Monitor
Text display : 40 x 25
Graphics display : 160 x 200 or 320 x 200
Colours : 121 Colours (15 Colours x 8 levels + Black)
Sound : two channels; 4 octaves + white noise
Keyboard : Full stroke 67 keys with 4 function keys and 4 cursor keys
Interface : Tape, Cartridge, Joystick (2), Floppy Disk, Printer, User port, RGB,
Interface : expansion bus port, serial bus
Data Storage : Cassette, Cartridge and 5.25” Disk Drive
Power Supply : Not Known