Apple Macintosh Plus

The Macintosh Plus, introduced in January 1986, was the third model in Apple's Macintosh line, offering significant improvements over its predecessors. It featured a 7.8 MHz Motorola 68000 processor, 1MB of RAM (expandable to 4MB), a 512 × 342 monochrome display, and was the first Mac to include a SCSI port, enabling support for external storage and peripherals. This pictured example boots from an external hard drive. The Plus also introduced a double-sided 800KB floppy drive, doubling disk capacity compared to earlier models. The Plus was the last compact Mac to use non-ADB (Apple Desktop Bus) ports. Its keyboard connected via an RJ-11 jack, similar to a telephone cord, while the mouse used a DE-9 connector. Later models, starting with the Macintosh SE, introduced ADB ports, allowing for more standardized peripheral connections.