Editing Commodore Plus/4 (section)

{{Short description|1984 home computer by Commodore International}}
{{Infobox computer
| logo         = Commodore Plus 4 logo.svg
| photo        = [[File:Commodore Plus 4.jpg|frameless]]
| caption      = Commodore Plus/4. Note the four arrow-shaped keys forming the [[cursor (computers)|cursor]] key "diamond" to the right.
| type         = [[Home computer]]
| release date = {{Start date and age|1984}}
| price        = {{US$|299|1984|round=-1}}<ref>InfoWorld, Volume 6, Issue 33, 13 August 1984, p. 9</ref>
| discontinued = 1985
| processor    = [[MOS Technology]] [[MOS Technology 7501|7501]] or [[MOS Technology 8501|8501]] <br> @ {{nowrap|1.76 MHz}}
| graphics     = [[MOS Technology TED|TED]] ({{nowrap|320 × 200}}, {{nowrap|121 colors}}<!-- contradicts/"explains" official:

https://www.karlstechnology.com/commodore/Commodore-Computer-Plus-4-Service-Manual.pdf
"128 Colors (16 colors; 8 luminance levels)."

Why missing 7 colors? "15 colors in 8 luminance, giving 120 shades of color levels plus black." at [[Commodore 16]] -->)<ref name=DatorMuseum>{{cite web |url=https://www.karlstechnology.com/blog/commodore-plus-4/ |title= Commodore Plus/4 Specifications |date=6 January 2018 |publisher=Dator Museum |access-date=May 21, 2019}}</ref>
| sound        = [[MOS Technology TED|TED]] (2-channel with 4-octave + white noise)
| memory       = 64 [[Kilobyte|KB]] [[random-access memory|RAM]] + 64 [[Kilobyte|KB]] [[read-only memory|ROM]]
| OS           = [[Commodore BASIC]] 3.5
| manufacturer = [[Commodore Business Machines]]
}}

The '''Commodore Plus/4''' is a [[home computer]] released by [[Commodore International]] in 1984. It was part of the Commodore 264 series, which also included the [[Commodore 16]] and [[Commodore 116]] models. The Plus/4 was marketed as "the productivity computer with software built in," featuring a four-application [[ROM]]-resident office suite that included a word processor, spreadsheet, database, and graphing software.

Internally, the Plus/4 shared the same basic architecture as the Commodore 16 and 116, allowing it to use software and peripherals designed for these models. However, it was incompatible with the [[Commodore 64]]'s extensive software library and some of its hardware. The Plus/4 was intended to expand the home computer market by targeting users interested in serious applications rather than gaming.

The Plus/4 featured a compact plastic casing with a fully-fledged keyboard, although the cursor and function keys were made of rubber. It had an advanced [[BASIC]] version 3.5, which made its software incompatible with the Commodore 64. Despite its potential, the Plus/4 was criticized for its lack of compatibility with the C64 and its deficiencies in sound and graphics compared to its predecessor.

Commodore produced approximately 827,000 units worldwide, with a significant number sold in Germany. The Plus/4 was discontinued in 1985, but systems remained available from liquidators for several years afterward.