Introduced in January 1986, two years after the original Macintosh, the Plus came with 1MB of RAM, a new double-sided 800KB floppy drive, and a built-in SCSI port for attaching external hard drives, scanners, or SCSI printers. Not only was 1MB more RAM than the PC-class machines could handle, but the Plus could be expanded to 4MB total RAM.
The original Mac Plus came in Apple beige; during 1987 the color was changed to platinum, the color of current Macs. There are unsubstantiated rumors that the power supply in the beige Plus was less reliable and prone to failure with 4MB configurations, a problem resolved with the "new" Plus.
The Plus was the last Mac not to use the ADB keyboard and mouse port. It was also the last to use DB-9 serial ports.
This page and site ©1997 by Daniel Knight.