Apple III, Disk III, Modem IIB (Novation CAT), Monitor III and Printer IIA (Centronics 779)

The Apple III (stylized as apple ///) is a business-oriented personal computer that was produced by Apple Computer and released in 1980. It was intended as the successor to the Apple II with features business users wanted—a full typewriter-style keyboard with upper and lowercase letters, multi-directional cursor keys and an 80-column display—but it failed in the market. It uses Apple's proprietary Sophisticated Operating System (SOS).

Designed by Wendell Sander, the Apple III was announced on May 19, 1980, and released in late November that year. Serious stability issues required a design overhaul and a recall of the first 14,000 machines produced. It was formally reintroduced on November 9, 1981, but damage to the computer's reputation had already been done. An updated version was released in December 1983 as the Apple III Plus.

The Disk II Floppy Disk Subsystem, often rendered as Disk ][, is a 5 +1⁄4-inch floppy disk drive designed by Steve Wozniak at the recommendation of Mike Markkula, and manufactured by Apple Computer. It went on sale in June 1978 at a retail price of US$495 for pre-order; it was later sold for $595 (equivalent to $2,940 in 2025) including the controller card (which can control up to two drives) and cable. The Disk II was designed specifically for use with the 1977 Apple II personal computer to replace the slower cassette tape storage.

Apple produced at least six variants of the basic 5 +1⁄4-inch Disk II concept over the course of the Apple II series' lifetime: The Disk II, the Disk III, the DuoDisk, the Disk IIc, the UniDisk 5.25" and the Apple 5.25 Drive. While all of these drives look different, and use four different connector types, they're all electronically extremely similar. They can all use the same low-level disk format, and are all interchangeable with the use of simple adapters, consisting of no more than two plugs and wires between them. Most DuoDisk drives, the Disk IIc, the UniDisk 5.25" and the AppleDisk 5.25" even use the same 19-pin D-Sub connector, so they are directly interchangeable. The only 5 +1⁄4" drive Apple sold aside from the Disk II family was a 360k MFM unit made to allow Mac IIs and SEs to read PC floppy disks.

The Apple Monitor III (stylized monitor ///) is a 12-inch green phosphor (A3M0039) or white phosphor (A3M0006) CRT-based monochrome monitor manufactured by Sanyo and later Hitachi for Apple Computer; for the Apple III personal computer, introduced in 1980. As Apple's first monitor in their business line of machines, it preceded the Apple Monitor II by several years. The Apple Monitor III's main feature was the fine mesh on the CRT to reduce glare. It was also notable for having a very slow phosphor refresh, which adversely created a ghosting effect with any video movement. The Apple Monitor III was also compatible with the entire Apple II series and numerous other computers through its standard composite video input jack.

A monitor stand for the Monitor III was available from Apple, to accommodate the narrower width of the Apple II case.

Centronics Data Computer Corporation was an American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name, the Centronics connector.